Patent Publication Number: US-10760749-B2

Title: Recessed light fixtures for efficiently providing aesthetically pleasing indirect lighting

Description:
FIELD OF DISCLOSURE 
     The present disclosure generally relates to light fixtures, and more particularly, recessed light fixtures that efficiently provide aesthetically pleasing indirect lighting. 
     BACKGROUND 
     Recessed lighting systems are commonly used indoors to provide the effect of light shining through a hole in a ceiling or wall. Recessed lighting systems generally include a light fixture installed in a ceiling or wall recess. Depending on the desired illumination scheme, the light fixture is typically configured to provide either direct lighting or indirect lighting. 
     Direct lighting involves casting light primarily in one direction to illuminate an individual object (e.g., a painting, a table, a kitchen counter, etc.) or limited portion of a room, or even for general illumination purposes. A can light is one example of a recessed lighting system incorporating a direct lighting light fixture. While direct lighting tends to be very efficient, it tends to create glare and shadows and therefore is typically not used for illuminating a large area or an entire room. 
     Indirect lighting, on the other hand, provides more diffuse lighting and is suitable for illuminating large areas. Indirect lighting involves bouncing light off a reflective surface, thereby redirecting and/or scattering the light to various portions of a room. While indirect lighting reduces glare and provides generally uniform luminance levels, it can be inefficient and uneconomical since at least some of the light is absorbed by the reflective surface. Moreover, because of its diffuse nature, indirect lighting is generally not suitable for spotlighting an individual object. 
     Some known sources of indirect lighting have been created with decorative patterns to enhance the architecture of a space. While such decorative patterns do not affect the aesthetic value of the provided indirect lighting, they do affect the efficiency of the indirect lighting, thereby further exacerbating the inefficiency of indirect lighting. 
     The present disclosure sets forth various recessed light fixtures embodying advantageous alternatives to existing recessed lighting systems and that may address one or more of the challenges or needs mentioned above. 
     SUMMARY 
     One aspect of the present disclosure provides a recessed light fixture configured to deliver indirect light to an area. The recessed light fixture includes a trim component, a reflector coupled to the trim component, and an annular ring including a plurality of light-emitting diodes (LEDs). The trim component has an outer wall and an inner wall spaced radially inward of the outer wall, and defines an annular recess between the outer and inner walls. The reflector includes a patterned reflective surface. The annular ring is arranged within the annular recess of the trim component. The LEDs are configured to emit light toward the reflector so that the reflector redirects the light to deliver the indirect light to the area. 
     Another aspect of the present disclosure provides a recessed light fixture configured to deliver indirect light to an area. The recessed light fixture includes a trim component, a dome-shaped reflector coupled to the trim component, and an annular ring including a plurality of light-emitting diodes (LEDs). The trim component has an outer wall and an inner wall spaced radially inward of the outer wall, and defines an annular recess between the outer and inner walls. The reflector includes a patterned reflective surface including a plurality of decorative features. The annular ring is arranged within the annular recess of the trim component. The LEDs are configured to emit light toward the reflector so that the reflector redirects the light to deliver the indirect light to the area. 
     Another aspect of the present disclosure provides a recessed light fixture configured to deliver indirect light to an area. The recessed light fixture includes a trim assembly, a reflector coupled to the trim assembly, and an annular ring including a plurality of light-emitting diodes (LEDs). The trim assembly includes an annular track member and a flanged portion. The annular track member has an outer wall and an inner wall spaced radially inward of the outer wall, and defines an annular recess between the outer and inner walls. The flanged portion is at least partially disposed in the annular recess. The reflector includes a patterned reflective surface including a plurality of decorative features. The annular ring is seated on the flanged portion within the annular recess of the trim component. The LEDs are configured to emit light toward the reflector so that the reflector redirects the light to deliver the indirect light to the area. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of one example of a recessed light fixture constructed in accordance with the principles of the present disclosure. 
         FIG. 2  is similar to  FIG. 1 , but shows a housing of the recessed light fixture when a trim and a reflector of the recessed light fixture are removed. 
         FIG. 3  is an end view of the trim and the reflector of the recessed light fixture. 
         FIG. 4  is a cross-sectional view of  FIG. 3 . 
         FIG. 5  is a cross-sectional view of the recessed light fixture when installed in a recessed portion of a ceiling. 
         FIG. 6  is a close-up view of a first portion of  FIG. 5 . 
         FIG. 7  is a close-up view of a second portion of  FIG. 5 . 
         FIG. 8  is similar to  FIG. 7 , but shows the output of light from a plurality of light-emitting diodes of the recessed light fixture. 
         FIG. 9  is another cross-sectional view of the recessed light fixture when installed in a recessed portion of a ceiling, showing the reflector being moved in a vertical direction so as to facilitate access to a junction box of the recessed light fixture. 
         FIG. 10  is a cross-sectional view of another example of a recessed light fixture constructed in accordance with the principles of the present disclosure. 
         FIG. 11  is a cross-sectional view of another example of a recessed light fixture constructed in accordance with the principles of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure is generally directed to recessed light fixtures that provide indirect lighting. The recessed light fixtures generate the indirect lighting by including a plurality of light-emitting diodes (LEDs) that emit light rays toward a curved reflector, which in turn scatters and/or redirects the light rays to various portions of a room. The indirect lighting provided by the recessed light fixtures disclosed herein generally uniformly illuminates the room without glare. The recessed light fixtures disclosed herein are, however, also provided with decorative patterns that enhance the architecture of the room and are configured to illuminate or highlight these decorative patterns in a manner that does not reduce the lighting output or efficacy of the fixture. The recessed light fixtures described herein are thus able to efficiently provide aesthetically pleasing indirect lighting. 
       FIGS. 1-9  depict one example of a recessed light fixture  100  constructed in accordance with the principles of the present disclosure. The recessed light fixture  100  is configured to provide indirect light to an area in a manner that illuminates the area without glare and also highlights decorative elements in the light fixture  100  without significantly reducing the lighting output and efficacy of the light fixture  100 . 
     The illustrated light fixture  100  includes a housing  104 , a trim assembly  108  coupled to the housing  104 , a reflector  112  coupled to the trim assembly  108 , and an annular ring  113  coupled to the trim assembly  108  and including a plurality of light-emitting diodes (LEDs)  114 . In this example, the housing  104  is depicted as being installed in a recessed portion of a ceiling  116  such that the light fixture  100  is fully recessed within the ceiling  116  and substantially flush with an exterior surface  118  of the ceiling  116 , as best illustrated in  FIG. 5 . As a result, the light fixture  100  can be referred to herein as a flangeless light fixture. In other examples, the light fixture  100  can be installed in a recessed portion of a wall, a recessed portion of a floor, or some other architectural structure, as desired. Additionally or alternatively, the light fixture  100  can be installed such that it is only partially recessed (i.e., not fully recessed) within the ceiling or other architectural structure. In any event, when the housing  104  is so arranged in the ceiling  116 , the LEDs  114  are configured to provide the above-described lighting, via the reflector  112 , to the area surrounding the ceiling  116 . 
       FIG. 2  illustrates the light fixture  100  with the trim assembly  108 , the reflector  112 , and the LEDs  114  removed from the housing  104 . In this example, the housing  104  is made of a sheet metal, e.g., aluminum, steel, tin, nickel, but the housing  104  can alternatively be made of a non-sheet metal or other suitable material. As illustrated in  FIG. 2  and in  FIG. 5 , the housing  104  is defined by a top wall  119 , a bottom wall  120 , and four side walls  122  extending between and connecting the top wall and the bottom wall  120 . The housing  104  also includes an opening  124  formed or defined in the bottom wall  120 . The opening  124  in this example has a circular shape and is centered about a longitudinal axis A. Of course, in other examples, the opening  124  can vary in shape and/or size and/or can be centered about a different axis. 
     With reference still to  FIGS. 2 and 5 , the light fixture  100  also includes a junction box  126  coupled to one of the side walls  122  of the housing  104 . In other examples, the junction box  126  can be arranged differently (e.g., coupled to a different portion of the housing  104 ). As best illustrated in  FIG. 5 , the light fixture  100  also optionally includes a biasing element  128  coupled to the top wall  119  or otherwise arranged within the housing  104 . The biasing element  128  is arranged to help regulate movement of the reflector  112  relative to the housing  104  so as to allow access to the junction box  126 , when such access is desired, and to help properly align the reflector  112  within the housing  104  (and more particularly the opening  124 ). While not specifically described herein, it will also be appreciated that the light fixture  100  can include other components, such as, for example, a controller, a mounting structure for mounting the housing  104  within the ceiling  116 , electric conductors, low-voltage transformers, and other components necessary for the operation of the light fixture  100 . 
     With specific reference to  FIGS. 4-7 , the trim assembly  108  in this example includes an annular track member  130  and a flanged portion  131  disposed within the annular track member  130 . In other examples, the trim assembly  108  may only include the annular track member  130  (i.e., no flanged portion  131 ), as will be described in greater detail below. In this example, the trim assembly  108  is made of a die cast aluminum, but the trim assembly  108  can alternatively be made of a different type of metal (e.g., aluminum, steel) and/or other suitable material, and/or be made in a different manner. 
     As best illustrated in  FIGS. 5 and 6 , the annular track member  130  includes an outer wall  132 , an inner wall  136  spaced radially inward of the outer wall  132 , and a base surface  140  extending between and connecting the outer and inner walls  132 ,  136 . The outer wall  132  in this example is a vertical wall that extends upward from a top of the base surface  140  in a vertical direction, such that the outer wall  132  is substantially parallel with the longitudinal axis A. In other examples, the outer wall  132  can be inclined relative to the base surface  140 . The annular track member  130  is coupled to the housing  104  such that the outer wall  132  is disposed radially inward of and immediately adjacent (and in some cases in contact with) an inner surface of the housing  104  that defines the circular opening  124 . As illustrated, the inner wall  136  is inclined relative to the outer wall  132  (and, thus, the longitudinal axis A). In this example, the inner wall  136  is oriented at an angle of approximately 45 degrees relative to the outer wall  132  (and approximately 45 degrees relative to the base surface  140  and the longitudinal axis A). In other examples, the inner wall  136  can be oriented at a greater or less angle relative to the outer wall  132  (and a lesser or greater angle, respectively, relative to the base surface  140 ). In one example, the inner wall  136  can be oriented at an angle of between approximately 20 degrees and approximately 80 degrees relative to the base surface  140 . As illustrated in  FIGS. 1, 5, and 6 , a portion of the base surface  140  protrudes slightly outward of the housing  104 , but when the light fixture  100  is installed within the ceiling  116 , this portion of the base surface  140  is substantially flush with the exterior surface  118  of the ceiling  116 . The annular track member  130  also includes an annular recess  144  defined between the outer and inner walls  132 ,  136 , as well as an opening  146  that is defined by the inner wall  136  and allows indirect light to be directed or provided to the area. As illustrated, the opening  146  of the annular track member  131  has a circular shape that has a smaller diameter than the circular opening  124  of the housing  104 . The circular opening  146  is substantially concentric with the circular opening  124  (both are centered about the longitudinal axis A). 
     As best illustrated in  FIGS. 6 and 7 , the flanged portion  131  includes a vertical wall  148 , a horizontal wall  150 , and a transition wall  151  connecting the vertical wall  148  and the horizontal wall  150 . When the flanged portion  131  is disposed within the annular track member  130 , at least a portion of the vertical wall  148  is disposed in the recess  144  at a position immediately adjacent (and in some cases in contact with) the outer wall  132 , and the horizontal wall  150  is also disposed in the recess  144 , but at a position immediately adjacent (and in some cases terminates against) the inner wall  136 . 
     As best illustrated in  FIGS. 3-7 , the reflector  112  in this example is preferably injection molded and has a dome-shape defined by a crown or center  152 , a perimeter portion  154 , a semi-cylindrical exterior surface  156 , and a semi-cylindrical interior surface  160 . In other examples, the exterior surface  156  and/or the interior surface  160  can vary in shape (i.e., curvature) and or size. As an example, the exterior surface  156  and the interior surface  160  can be parabolic, hyperbolic, planar and horizontal, triangular, or take on some other shape. 
     When the reflector  112  is coupled to the trim  108 , the center  152  of the reflector  112  is co-axially aligned with the longitudinal axis A. The exterior surface  156 , which is not visible to occupants of the area when the fixture  100  is installed and operational, extends between the center  152  and the perimeter portion  154 . The interior surface  160  also extends between the center  152  and the perimeter portion  154 , but, unlike the exterior surface  156 , the interior surface  160  is at least partially visible to occupants of the area when the fixture  100  is installed and operational. As illustrated, the perimeter portion  154  of the reflector  112  is arranged in the annular recess  144  such that the crown  152  is centrally located within the annular track member  130  and the exterior and interior surfaces  156 ,  160  are disposed radially inward of the outer wall  132  (with the reflector  112  spanning almost the entirety of the annular track member  130 ). In some cases, the perimeter portion  154  of the reflector  112  is seated against the flanged portion  131  (e.g., against the horizontal wall  150  and/or the transition wall  151 ). A portion of the exterior and interior surfaces  156 ,  160  are also arranged within the annular recess  144 , but the remainder of the exterior and interior surfaces  156 ,  160  are arranged outside of the annular recess  144  (and more generally the annular track member  130 ), but within the housing  104 , as illustrated in  FIGS. 5 and 6 . 
     As best illustrated in  FIG. 4 , the reflector  112  has a depth D 1  defined by a distance between the center  152  and a plane  164  extending through the perimeter portion  154  of the reflector  112 . The depth D 1  preferably has a value that is equal to or less than 50% of an inner diameter D 2  of the perimeter portion  154 . In one example, the depth D 1  is equal to 2.5 inches and the diameter D 2  of the perimeter portion  154  is equal to 5 inches. In another example, the depth D 1  is equal to 4 inches and the diameter D 2  of the perimeter portion  154  is equal to 8 inches. In yet another example, the depth D 1  is equal to 4 inches and the diameter D 2  of the perimeter portion  154  is equal to 12 inches. Other values are possible as well. Alternatively or additionally, the depth D 1  may have a value that is equal to or less than 50% of an outer diameter D 3  of the perimeter portion  154 . 
     In the illustrated example, at least 50% of the interior surface  160  is reflective, such that the reflector  112  redirects light out through the opening  146  and into the area surrounding the ceiling  116 . In some cases, the interior surface  160  will be entirely (100%) reflective; in other cases, however, the interior surface  160  may only be 50%, 60%, 70%, 80%, 90%, or some other percentage between 50% and 100%, reflective. 
     As best illustrated in  FIGS. 3, 4, and 6 , the reflective surface  160  includes a decorative pattern  164  that enhances the aesthetic appeal of the light fixture  100 . The illustrated decorative pattern  164  includes a plurality of concentrically arranged features  168 . The plurality of features  168  includes a first row of features  168 A and a second row of features  168 B that partially overlap with the first row of features  168 A. 
     The features  168 A originate at or immediately proximate the center  152  of the reflector  112 , and terminate at a position between the center  152  and the perimeter portion  154  of the reflector  112 . As best illustrated in  FIG. 6 , each of the features  168 A has a petal-like shape defined by a petal base  172 A, a petal end  172 B, and a pair of opposing sides  172 C that extend between and connect the petal base  172 A and the petal end  172 B. Each petal base  172 A is preferably curved such that an arc traced therethrough has a radius of curvature that is smaller than a radius of the perimeter portion  154  (the radius being equal to 50% of the diameter D 2 ). The sides  172 C of each petal shaped feature  168 A preferably have at least a portion that is substantially perpendicular to a plane defined by the ceiling  116  (and perpendicular to the longitudinal axis A). As an example, the sides  172 C of each petal shaped feature  168 A may have a portion that is exactly perpendicular to the plane or oriented at a slight angle (e.g., 5 degrees) relative to the plane defined by the ceiling. The sides  172 C of each petal shaped feature  168 A also converge toward one another from the base  172 A to the petal end  172 B, as illustrated. 
     The features  168 B, meanwhile, originate at or immediately proximate at a petal base  172 A of the features  168 A, respectively, and terminate at a position between the center  152  and the perimeter portion  154  of the reflector  112  (this position being closer to the perimeter portion  154  than the position at which the features  168 A terminate). Like the features  168 A, each of the features  168 B is shaped like a petal defined by a petal base  174 A, a petal end  174 B, and a pair of opposing sides  174 C that extend between the petal base  174 A and the petal end  174 B. Each petal base  174 A is preferably curved such that an arc traced therethrough has a radius of curvature that is smaller than a radius of the perimeter portion  154  (the radius being equal to 50% of the diameter D 2 ). Each petal end  174 B is positioned at or immediately adjacent a respective one of the petal bases  172 A. The sides  174 C of each petal shaped feature  168 B converge toward one another from the base  174 A to the petal end  174 B. 
     As illustrated, the features  168 B are generally larger than the features  168 A. More specifically, the petal bases  174 A are wider than the petal bases  172 A, the petal ends  174 B are wider than the petal bases  172 B, and the sides  174 C are longer than the sides  172 C. One of ordinary skill in the art will thus appreciate that the features  168  increase in size as the decorative pattern  164  extends from the center  152  toward the perimeter portion  154  of the reflector  112 . 
     With reference now to  FIGS. 5-7 , the annular ring  113  is generally arranged within the annular recess  144  of the annular track member  130 . The annular ring  113  is preferably arranged such that it is parallel to a plane defined by the ceiling  116  (and perpendicular to the longitudinal axis A). In some cases, such as the illustrated example, the annular ring  113  is seated on the horizontal wall  150  of the flanged portion  131 , such that the annular ring  113  is indirectly coupled to the annular track member  130 . In other cases, however, the annular ring  113  can be directly coupled to the annular track member  130  or indirectly coupled to the annular track member  130  in a different manner. In any event, the annular ring  113  is arranged radially inward of the perimeter portion  154  of the reflector  112  and radially outward of an innermost surface  204  of the inner wall  136 . In other words, the annular ring  113  is arranged between the perimeter portion  154  and the innermost surface  204  of the inner wall  136 . 
     As best illustrated in  FIGS. 6 and 7 , the plurality of LEDs  114  are arranged on the annular ring  113 . The LEDs  114  are thus hidden from view by the inner wall  136  when the recessed light fixture  100  is installed in the ceiling  116 . The plurality of LEDs  114  are preferably spaced an equal distance apart from one another (though they do not have to be). More preferably, the LEDs  114  are spaced a distance that is less than or equal to ⅛ of the diameter D 2  of the perimeter portion  154 . The exact number of LEDs  114  will thus vary depending upon the spacing, but in one example, the annular ring  113  includes 72 LEDs  114 , with each LED  114  spaced approximately 5 degrees apart from one another around the annular ring  113 . Such an arrangement helps to provide a more uniform illumination of the patterned surface  164  when the light fixture  100  is in operation. 
     In operation, the LEDs  114  emit light in an upward direction, toward the reflector  112  (and away from the horizontal wall  150  of the flanged portion  132 ).  FIG. 8  illustrates an example of how light is output from the LEDs  114 . As illustrated, each LED  114  emits a first component of light L 1  in an upward and radially outward direction, and a second component of light L 2  in an upward and radially inward direction. The reflector  112 , particularly the reflective surface  160 , redirects the total light emitted from all of the LEDs  114  out through the opening  146  and into the area surrounding the light fixture  100 . The reflector  112  thus functions to illuminate the area by providing indirect lighting, without glare, to the area, as discussed above. At the same time, the indirect lighting highlights the decorative pattern  164  of the reflector  112 , and more particularly the decorative pattern  164  formed by the petal-shaped features  168 , all without reducing the lighting output and efficacy of the light fixture  100 . 
     With reference specifically to  FIG. 9 , the reflector  112  is movable in a vertical direction, i.e., a direction along the central longitudinal axis A, to permit access to the junction box  126  through the opening  146 , such that the light fixture  100  complies with electrical standard requirements. More particularly, the reflector  112  is movable in the vertical direction, away from the trim assembly  108  (and out of contact with the trim assembly  108 ) and toward the top wall  119  of the housing  104 . The reflector  112  moves in this vertical direction until the reflector  112  contacts the biasing element  128  arranged in the housing  104 , at which time the biasing element  128 , which includes a spring that is not visible, is compressed, and the biasing element  128  automatically drives the reflector  112  outward (leftward, when viewed in  FIG. 9 ) in a direction that is perpendicular to the central longitudinal axis A. Movement of the reflector  112  in this manner creates a pathway for a user of the light fixture  100  to access the junction box  126  through the opening  146  and the space created by the vacancy of the reflector  112  from its original position shown in  FIGS. 5 and 6 . 
     Of course, when access to the junction box  126  is no longer needed, the reflector  112  can be returned to its original position, shown in  FIGS. 5 and 6 , by pulling the reflector  112  back toward the trim assembly  108 . While this is happening, the biasing element  128  helps to ensure that the reflector  112  is properly positioned by providing feedback that the reflector  112  has reached the proper radial position. More particularly, when the reflector  112  is moved back inward (rightward, when viewed in  FIG. 9 ) to return the reflector  112  to its original position, the reflector  112  will contact the biasing element  128  when the reflector  112  reaches the proper radial position, thereby providing feedback that the reflector  112  can in turn be moved solely in the vertical direction back into position on the trim assembly  108 . 
       FIG. 10  depicts another example of a recessed light fixture  1000  constructed in accordance with the principles of the present disclosure. The recessed light fixture  1000  is substantially similar to the recessed light fixture  100 , with similar reference numerals used to indicate similar components. However, the reflective surface  160  of the reflector  112  of the recessed light fixture  1000  includes a decorative pattern  1164  that is different from the decorative pattern  164  described above. 
     As illustrated in  FIG. 10 , the decorative pattern  1164  also includes a plurality of features  1168 . The features  1168  are, like the features  168  described above, concentrically arranged in rows about the center  152  of the reflector  112 . As illustrated, the spacing between adjacent rows of features  1168  varies (in this case increases) as the decorative pattern  1164  extends from the center  152  toward the perimeter portion  154  of the reflector  112 . The features  1168  have a different shape than the features  168 —the features  1168  have a quasi-diamond shape that varies ever so slightly (in this case, sharpens) as the decorative pattern  1164  extends from the center  152  toward the perimeter portion  154  of the reflector  112 . In the illustrated example, the longitudinal extent (i.e., the height) of the projections  1168  increases as the decorative pattern  1164  moves toward the perimeter portion  154 . Thus, for example, the longitudinal extent (i.e., the height) of a projection  1170 A closer to the center  152  is less than the longitudinal extent (i.e., the height) of a projection  1170 B positioned closer to the perimeter portion  154 . In other examples, however, the shape of the projections  1168  may vary in a different manner (e.g., the longitudinal extent may decrease, a horizontal extent may increase or decrease, etc.). Each projection  1168  is preferably curved such that an arc traced through a lower edge thereof has a radius of curvature that is smaller than a radius of the perimeter portion  154  (the radius being equal to 50% of the diameter D 2 ). 
       FIG. 11  depicts yet another example of a recessed light fixture  1200  constructed in accordance with the principles of the present disclosure. The light fixture  1200  is substantially similar to the recessed light fixture  100 , with the exception that the light fixture  1200  is installed differently than the light fixture  1200 . Unlike the light fixture  100 , which is muddled to the ceiling  116  such that the light fixture  100  is fully recessed within the and substantially flush with the ceiling  116 , the trim assembly  108  and the reflector  112  of the light fixture  1200  are coupled to the housing  104  of the light fixture  1200  from below, as depicted. Thus, when the trim assembly  108  and the reflector  112  of the light fixture  1200  are coupled to the housing  104 , a portion of the trim assembly  108  protrudes downward, below the exterior surface  118  of the ceiling  116 , such that the light fixture  1200  is not completely flush with the ceiling  116 . The light fixture  1200  can thus be referred to herein as a flanged light fixture. Moreover, as a result, the reflector  112  of the light fixture  1200  is, like the reflector  112  of the light fixture  100 , movable in a vertical direction, i.e., a direction along the central longitudinal axis A, to permit access to the junction box  126  through the opening  146 , but the vertical direction of movement is opposite the direction of movement for the reflector  112  of the light fixture  100 . As illustrated, the trim assembly  108  and the reflector  112  of the light fixture  1200  are movable in a downward direction (at least when viewed in  FIG. 11 ) away from the trim assembly  108  (and out of contact with the trim assembly  108 ) and away from and out of the housing  104 . Movement of the assembly  108  and the reflector  112  of the light fixture  1200  in this manner creates a pathway for a user of the light fixture  1200  to access the junction box  126  through the opening  146 . 
     While the invention has been described in connection with various embodiments, it will be understood that the invention is capable of further modifications. This application is intended to cover any variations, uses or adaptations of the invention following, in general, the principles of the invention, and including such departures from the present disclosure as, within the known and customary practice within the art to which the invention pertains.