baber/WOPTO huggingface dataset:
Patent CA-2022487-A1 (CA)
Title: Optimized fermentation processes for the preparation of foreign proteins in e.coli
Inventor: GROTE MATHIAS
IPC: C12N15/09
Filed: 1990-08-01
Abstract: The invention describes optimized fermentation processes for the preparation of foreign proteins in E.coli using the lac promoter or improved lac promoter (for example tac, trc). After the initial growth phase with glucose as carbon source, induction of product formation is effected (1) via IPTG with glucose limitation or (2) via lactose with lactose limitation or (3) via IPTG and lactose with lactose limitation. The limitation of glucose or lactose is such that the oxygen partial pressure remains above 10%.
Patent CA-2023508-A1 (CA)
Title: Isocyanate blends
Inventor: WILLIAMS GREGORY D
IPC: C08G18/02
Filed: 1990-08-17
Abstract: Mo3250 NOVEL ISOCYANATE BLENDS              ABSTRACT OF THE DISCLOSURE The present invention is directed to an isocyanate blend having an isocyanate group content of from about 16 to about 25% by weight and consisting essentially of:           A) a modified isocyanate having an isocyanate group content of from about 18 to about 25% by weight and prepared by reacting 1 mole of methyleneb is (phenyl isocyanate) with from about 0.1 to about 0.3 moles of a 134 to 700 molecular weight poly-1,2-propylene ether glycol, and B) an isocyanate having an isocyanate group content of from about 16 to about 22% by weight and prepared by reacting:  (i)  from about 40 to about 60 parts by weight of methylenebis(phenyl isocyanate), (ii) from 0 to about 10 parts by weight of a carbodiimide group modified methylene-bis(phenyl isocyanate) having an isocyanate group content of from about 24 to about 33% by weight, and (iii) from about 30 to about 50 parts by weight of a polyester diol having a molecular weight of from about 1000 to about 3000, with the amounts of (i), (ii) and (iii) totalling 100 parts by weight, the weight ratio of A) to B) being from 10:1 to 1:10.
Patent CA-2023620-A1 (CA)
Title: Flame retardant asphalt composition
Inventor: JOLITZ RANDAL J
IPC: C08L95/00
Filed: 1990-08-20
Abstract: ABSTRACT OF THE DISCLOSURE      Disclosed is a fire retardant asphalt composition. The composition comprises:      (a)  about 40-60% wt asphalt;      (b)  about 1-20% wt thermoplastic;      (c)  about 30-403 wt flame retarding agent; and (d)  the flame retarding agent comprises:           (i)   about 65-80% weight monoammonium phosphate, (ii)  about 5-15% weight ammonium sulfate; and (iii)  about 1% weight silicons polymer.            Variations of this composition have passed the UL 790 test for Class A flame retardant materials.     TAMA:015/C4
Patent CA-2025791-A1 (CA)
Inventor: ALLEN THOMAS E
IPC: B01F13/10
Filed: 1990-09-20
Abstract: A mixing apparatus comprises two or more tubs in which mix-tures can be mixed to obtain averaging of a particular property, such as density.  Two recirculation lines are used.  One recir-culates between an initial mixing tub and a mixing inlet, and the other recirculates from the additional, secondary averaging tub(s) and the mixing inlet.  Computer control responds to den-sities of fluids recirculated through both of the recirculation lines.  In a preferred embodiment, the computer is also respon-sive to pressure of one of the inlet substances.  In response to these measured inputs and other data entered through a data entry terminal, the computer generates control signals for controlling the inputs of both of two inlet substances.  In a preferred embo-diment, the apparatus and a corresponding method utilize displa-cement tanks both as averaging tubs and as conventional displace-ment tanks.
Patent CA-2028221-A1 (CA)
Inventor: FRIEDMAN ROBERT H
IPC: C09K8/60
Filed: 1990-10-22
Abstract: TREATING UNDERGROUND FORMATIONS           ABSTRACT D# 79, 250 -F           Wells  penetrating  oil-producing  and  water-producing intervals may be treated in order to reduce the flow rate of water into the well by isolating the water-producing interval and introducing into it a volume of treating fluids sufficient to invade  at  least  six  inches  into  the  permeable  formation comprising the water-producing interval.   Cased wells may be treated to plug holes in the casing caused by corrosion or casing breaks  by  introducing  a  treating  fluid  into the  formation adjacent to the break.  The treating fluid comprises a material which can be acid catalyzed in a period of from 1 to 16 hours at formation  conditions,  preferably  a  monomer  or  oligomer  of furfuryl alcohol.   The treating fluid contains from 40 to 60 percent furfuryl alcohol and from 40 to 60 percent of an ester, preferably ethyl acetate or butyl  acetate.   The catalyst  is preferably orthonitrobenzoic acid or toluene sulfonic acid in a concentration of from  1 to 4 percent by weight.   The acid and concentration of acid are selected to produce a set time at the formation temperature in the range of from 1 to 16 hours, so the treating fluid will flow into and saturate the pore space of the portion of the formation being treated.
Patent CA-2031654-A1 (CA)
Inventor: NAKAI YOSHITO
IPC: C09D5/16
Filed: 1990-12-06
Abstract: This invention discloses an antifouling paint which can retain antifouling properties over a long period of time comprising : (A) 100 parts by weight of a film forming resin, and (B) 1-50 parts by weight of a chain organopolysiloxane containing oxyalkylene groups and having an HLB of 3-12.
Patent CA-2032414-A1 (CA)
Inventor: HARRISON CLARENCE
IPC: G11B20/14
Filed: 1990-12-17
Abstract: A two-frequency data signal is accurately decoded by sampling the  signal  and digitizing the  samples to provide  a series of digital values representing the signal. An intelligent digital  filter manipulates  the  digital  values  to  decode  the signal, by detecting the peaks in the sampled signal and decoding the signal by analyzing the location and amplitudes of the peaks. Only peaks which are outside a guard band may be detected. If the signal cannot be properly decoded with a wide guard band,  the guard band may be repeatedly narrowed, until a minimum guard band is reached. Bits are identified by comparing the displacements between  peaks  to  a  bit  cell  width.  An  even  number  of displacements  indicates  a  '0'  bit,  and  an  odd  number  of displacements indicates a '1' bit. Once a bit is decoded, the bit cell width is incremented by a predetermined amount if the bit cell width is wider than the current bit cell width,  and is decremented by a predetermined amount if the decoded bit cell width is narrower than the current bit cell width.  If no peaks are found within a maximum allowable bit cell width, this area is delimited as bad.
Patent CA-2034338-A1 (CA)
Title: Method for controlling the cure rate of silicone foam
Inventor: GROSS DAVID C
IPC: C08L83/04
Filed: 1991-01-17
Abstract: PATENTS 60SI-1328/0218m Abstract of the Disclosure A method is provided for controlling the cure time of a platinum-catalyzed addition cured silicone foamable composition, comprising the step of  adding  to  the  composition  an  aqueous buffer solution having a pH of about 2 to about 10, wherein cure time is  increased if the pH of the buffer solution  is higher than the pH of the composition prior to the addition thereto of the  buffer  solution  and  decreased  if  the  pH  of  the  buffer solution is lower than the pH of the composition prior to the addition thereto of the buffer solution.
Patent CA-2034620-A1 (CA)
Inventor: MURATA YUKIO
IPC: H02J7/00
Filed: 1991-01-21
Abstract: In a charge device having a storage cell terminal for connection to a storage cell to be charged, a trickle charge terminal for receiving a trickle charge voltage, and a boost charge terminal  connected to the  storage  cell terminal for receiving a boost charge voltage and including a constant current circuit for causing a constant current to flow from the trickle charge terminal to the storage cell terminal, a boost charge detector detects the boost charge voltage to produce a boost charge signal when the boost charge terminal is supplied with the boost charge voltage. An interrupting circuit interrupts the constant current when the boost charge detector circuit produces the boost charge signal.    The  constant  current  circuit  may  comprise  a transistor having a base electrode supplied with the trickle charge voltage to produce the constant current.   In this event, the interrupting circuit is a conductor connected between the boost charge detector and the base electrode of the transistor.
Patent CA-2036535-A1 (CA)
Title: Electrical outlet box assembly for power and communication wires
Inventor: LENGYEL SZABOLCS G
IPC: H02G3/18
Filed: 1991-02-18
Abstract: An electrical outlet box assembly for separating and insulating high voltage power wires from low voltage communication wires. The electrical outlet box assembly includes a housing adapted to be embedded into a poured concrete floor, an electrical shielding assembly coupled within the housing, a leveling assembly for coupling and leveling an electrical receptacle to the housing, a floor plate or carpet flange, and a receptacle cover. The electrical shielding assembly includes a wiring enclosure releasably coupled to the housing by a snap fit having an interior passage for receiving and separating the high voltage power wires from the low voltage communication wires which pass over the exterior of the wiring enclosure, and a receptacle insulator member adapted to surround a receptacle mounted in the housing. The leveling assembly includes a receptacle mounting member having four coupling flanges with elongated slots, four retaining clips fixedly coupled in slots in the housing, and four leveling screws which are received in the elongated slots of the coupling flanges and threadedly coupled to the retaining clips for leveling and adjusting the height of the receptacle mounting member.
Patent CA-2037198-A1 (CA)
Title: Light-emitting semiconductor device using gallium nitride group compound
Inventor: MANABE KATSUHIDE
IPC: H01L33/00
Filed: 1991-02-27
Abstract: Disclosed herein is a light-emitting semiconductor device that includes a gallium nitride compound semiconductor (AlxGa1-xN) comprising an n-layer and an i-layer, at least one of them being of a double layer structure. In one embodiment the n-layer has a double-layer structure including an n-layer of a low carrier concentration and an n+-layer of a high carrier concentration, the former being adjacent to the i-layer. In another embodiment, the i-layer has a double-layer structure including an iL-layer of a low impurity concentration containing p-type impurities in a comparatively low concentration and an iH-layer of a high impurity concentration containing p-type impurities in a comparatively high concentration, the former being adjacent to the n-layer. In still another embodiment, both of the n-layer and the i-layer have a double layer structure. Also disclosed is a method for producing the light-emitting semiconductor device which employs a vapor phase epitaxy. In one preferred method, an n-type gallium nitride compound semiconductor (AlxGA1-xN) having a controlled conductivity is produced from an organometallic compound by vapor phase epitaxy, by feeding a silicon-containing gas together with other raw material gases at a controlled mixing ratio.
Patent CA-2038775-A1 (CA)
Title: Vacuum control system for lifting systems
Inventor: MESSINGER ROBERT
IPC: B66F3/35
Filed: 1991-03-27
Abstract: ABSTRACT OF THE DISCLOSURE      This invention provides improved body length adjustment means for a vacuum powered lifting system of the type that embodies a variable length lifting body responsive to the differential of pressure inside that body with atmospheric pressure to resolve critical manual control problems.  Thus control is provided by proportional movement of a control member over a substantially linear range producing a smooth progressive movement of the lifting mechanism.  This permits non-critical lowering and release of a work load object by unskilled operators.  Thus, an air injection valve with an air release port is positioned within the lifting body having an elongated slot operable over a control range proportionately change to the body length by release of a progressively increasing flow of air into the body to increase air pressure and body length over the critical range of lowering and releasing the work load object in response to a corresponding substantially linear movement of the control member.  Variable adjustment means establishes a known upper lift limit by control of the length of the body both under loaded and unloaded conditions, and provisions are made to keep a vacuum responsive work object grasping means continuously operable.
Patent CA-2040642-A1 (CA)
Title: Surface modification detector system
Inventor: BURCHILL MICHAEL T
IPC: G01N21/33
Filed: 1991-04-17
Abstract: ABSTRACT OF THE DISCLOSURE An apparatus and method for detecting the presence of a modifier ingredient, such as an UV stabilizer, in a substrate surface. Ultraviolet radiation is generated and directed to a desired area of the substrate surface.  An image of the desired area of the surface is formed at an image plane and a detector is disposed at the image plane for detecting fluorescent radiation incident thereon.  The detector generates a signal in response to fluorescent radiation incident thereon that is representative of the degree to which the substrate surface has been modified.
Patent CA-2040708-A1 (CA)
Title: Collapsible lumen catheter for extracorporeal treatment
Inventor: ULDALL PETER ROBERT
IPC: A61M25/00
Filed: 1991-04-17
Abstract: A dual lumen catheter is disclosed for providing extracorporeal treatment such as hemodialysis, which is percutaneously inserted for either short-term or long-term vascular access. The catheter includes a main body having proximal and distal segments connected to a pair of clamping limbs via a manifold. The distal segment includes two tubular members laterally attached to each other, one of which is thinner than the other and collapsible for inserting the catheter through a much smaller diameter peel-away sheath. Contrary to existing practices, the lengths of the arterial and venous tubular members are reversed such as to provide a longer negative pressure intake lumen. A hydrophilic slip coating covers the distal segment to further ease the insertion of the distal segment into the peel-away sheath. The cross-sectional area of the proximal segment is generally elliptical shaped for providing a leak proof fit through the vascular access site. A ring-like grommet moveable along the proximal segment anchors the catheter to the surrounding tissue. The lumens extending throughout the entire catheter are generally circular in nature and substantially equal in cross-sectional area to provide substantially equal flows of intake and return blood and to minimize clotting. The wall thickness of the negative pressure intake member is approximately one and a half to three times as thick as that of the thin-walled positive pressure tubular wall to maintain adequate flows of blood without collapsing or stretching.
Patent CA-2041764-A1 (CA)
Inventor: DESPERBEN LYDIE
IPC: H04L27/00
Filed: 1991-05-03
Abstract: The present invention relates to an apparatus for estimating frequency offset. 
<??>The apparatus for estimating frequency offset between the carrier wave of a reception signal (R) and a local signal (L), this reception signal having been the subject of a modulation with several phase states and therefore exhibiting a phase comprising a transmission phase shift, a modulation phase shift and a synchronisation phase shift, comprises a demodulation unit for producing samples (E) of the reception signal for which the transmission phase shift is suppressed. It moreover comprises means (12, 13) for detecting the modulation phase shift of these samples so as to suppress it. It also comprises means (16) for producing the average phase of a series of samples, the frequency offset then being estimated by taking the difference of the average phase of two series of samples, referred to the period separating the middle of these series. 
<??>It finds an advantageous application in the area of digital cellular radiocommunication systems. 
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Patent CA-2041924-A1 (CA)
Title: Method for determining the transmission quality of a home traffic connection in a mobile radio system
Inventor: BORG LARS U
IPC: H04B7/26
Filed: 1991-05-07
Abstract: A base station (BS1) in a mobile radio system has connection in a first cell (1) with a mobile station (MS1) on a two-way channel (K1) having two carrier frequencies. A base station (BS2) and a mobile station (MS2) in a second cell (2) remote from the first cell are mutually connected on the channel (K1) disturbing the connection in the first cell (1) through signals (Fl, R1). The combined signal strength of the disturbing (F1, R1) and the home connection (K1) is measured. The signal strength of solely the disturbing connection (F1, R1) is also measured, the carrier frequency of home connection being closed down. The quotient between these signal strengths is a measure of connection quality.      The stations (MS1,BS1) may include means for closing down their respective carrier frequencies when no information is transmitted, the receiving station then measuring the disturbing signal strength. In time-shared systems, the disturbing signal can be measured during time slots which belong to connections other than. the home connection.
Patent CA-2044146-A1 (CA)
Inventor: TADROS MAHER E
IPC: H05K3/26
Filed: 1990-01-05
Abstract: Cleaning solutions for printed circuit boards are disclosed, comprising dialkyl esters of C4 to C6 acids and from 0 to 40 percent of a non-ionic surfactant.
Patent CA-2045905-A1 (CA)
Title: Process for recovering organic vapors from air
Inventor: LEE KUNG H
IPC: B01D53/22
Filed: 1991-06-28
Abstract: TITLE IMPROVED PROCESS FOR RECOVERING     ORGANIC VAPORS FROM AIR                 ABSTRACT OF THE DISCLOSURE         A process for separating and recovering organic vapors (e.g., chlorofluorocarbons) from a feed stream of organic vapors and air wherein organic vapors are present in the "window concentration" range being too high for conventional carbon adsorption and too low for efficient compression/condensation recovery.  By passing the organic vapor and air feed stream through the feed side of a semipermeable membrane unit, a vapor depleted stream exiting the membrane unit can then be processed by conventional carbon adsorption while a vapor enriched stream from the membrane unit can be processed by conventional compression and condensation.
Patent CA-2046332-A1 (CA)
Inventor: NEEL JEAN M L
IPC: B01D71/38
Filed: 1990-12-03
Abstract: ABSTRACT   Composite membrane for separating water from fluid mixtures containing organic components by means of pervaporation comprising a separating layer of cross-linked polyvinyl alcohol, which has been subjected to a post-cross-linking by treatmentwith acids acting in the vapor phase on the polyvinyl alcohol layer. The acids are preferably hydrohalic acids, sulfurous acid, sulfuric acid, nitrous acid, nitric acid or acetic acid.
Patent CA-2046337-A1 (CA)
Title: Improved transdermal system for the administration of pharmacological compounds under ph-controlled conditions
Inventor: GUPTE ARUN R
IPC: A61K9/70
Filed: 1990-11-29
Abstract: The invention relates to an improved transdermal administration of pharmacologically active compounds.
Patent CA-2047754-A1 (CA)
Inventor: IZZO THEODORE-JAMES
IPC: A63B55/00
Filed: 1991-01-02
Abstract: 2047754 9109550 PCTABS00005 A dual shoulder strap assembly can either be retrofit or provided as original equipment for a golf bag having first and second strap members (750, 751) connected in end-to-end relation to one another along one side of the golf bag, a handle grip (740) interconnecting adjoining ends of the strap members, and circumferential straps (760, 780) serve to connect opposite extreme ends of the first and second strap members to the golf bag in such a way as to maintain the bag in centered relation against the back of the carrier when the straps are passed over the shoulders. The upper and lower extreme ends (752) of the strap members are self-adjusting circumferentially, and the adjoining ends between the strap members (754, 755) are interconnected in such a way as to maintain the strap members in an elevated position so that the bag can be easily lifted off the ground and more easily placed on the shoulders of the carrier.
Patent CA-2049493-A1 (CA)
Inventor: TODD ALAN B
IPC: A63F9/00
Filed: 1991-08-19
Abstract: ABSTRACT OF THE DISCLOSURE    A game card includes a playing matrix with squares arranged in rows and columns.  Starter words or starter letters may be pre-printed in the playing matrix.  The player examines advertisements to derive words which are to be inserted in the playing matrix.  Aligned with the rows of the playing matrix are spaces for the player to identify the sources of the advertisements or for the sources to be identified to the player.  A word completion matrix aligned with the rows of the playing matrix is provided to receive the terminal portions of any words that are too long for the playing matrix.  After the player has completed the playing matrix he examines it in an attempt to find the maximum number of row words in the rows of the playing matrix and the maximum number of column words in the columns of the playing matrix.  The game card additionally includes a row word scoring region and a column word scoring region to guide the player in determining a row total and a column total, which are then combined into a game score.  The game score depends both on the player's word knowledge and artful selection of words derived from the advertisements and the player's verbal agility in identifying words in the rows and columns of the playing matrix.  The game card may be combined with a periodical such as a magazine to provide an educational amusement device, but it may also be used with other forms of advertising such as television commercials.
Patent CA-2049853-A1 (CA)
Title: Direct-current arc furnace
Inventor: STENKVIST SVEN-EINAR
IPC: F27D11/10
Filed: 1991-08-26
Abstract: ABSTRACT OF THE DISCLOSURE           A direct-current arc furnace has a furnace vessel which is surrounded by a metal shell, having at least one electrode connected as the cathode, and at least one bottom contact. The bottom of the furnace consists of a single or multiple lining layer which possesses  electrically  conducting  bricks  or  other equally acting inserts.   The lining layer lies on a contact plate covering most of the bottom, which con-tact plate forms the bottom contact connected as the anode and lies on a bottom plate.  The contact plate is  equipped with a plurality of connection fittings which pass through openings in the bottom plate and are connected via electric lines to a current-supply-ing device provided next to the furnace vessel.  One or more sections of the lining layer are composed of a material which possesses  a  lower  electrical  con-ductivity than the lining layer in the remaining sec-tion for the intentional deflection of the arc.
Patent CA-2050458-A1 (CA)
Title: Electrode
Inventor: CAIRNS JOHN F
IPC: C25B9/17
Filed: 1991-08-30
Abstract: An electrode which comprises a substrate of a valve metal or an alloy thereof having properties similar to those of the valve metal and a coating comprising an outer layer which comprises RuO2, an oxide of at least one non-noble metal and at least one other noble metal or oxide thereof and an intermediate layer having a composition different from that of the outer layer and which comprises RuO2 and an oxide of at least one non-noble metal. The electrode is particularly useful as an anode for an electrolytic cell, eg a chlor-alkali cell, it has a lifetime therein which is greater than the sum of the operational life-times of electrodes which comprise a valve metal substrate and which separately comprise one of the above layers which together form a part of the coating of that electrode.