baber/WOPTO huggingface dataset:
Patent CA-2244583-A1 (CA)
Title: Frequency-hopping spread-spectrum radio communications
Inventor: JANDRELL LOUIS H M
IPC: H04L12/56
Filed: 1998-08-07
Abstract: A method and apparatus for accessing a communication channel in a communications system having a transmitter and a receiver. Frequency-hopping spread-spectrum techniques are utilized in which the transmitter of the message assigns a message a priority. Once the message is assigned the priority, the transmitter then selects one of the frequencies from a set of pre-determined randomly-ordered set of frequencies utilized by the spread-spectrum system. Once the frequency is selected, a timer is set to a hop interval and started. The transmitter then senses the channel. If the channel is not clear by the time the timer expires, the transmitter returns to the step of selecting a frequency and resetting the timer. Once an available frequency is discovered, the method waits an interval based on the priority of the message. If the channel is still available the message is then transmitted. If the channel is not available, the timer is then checked, if the timer has expired, then the transmitter returns to the step of selecting a frequency and resetting the timer. Otherwise the transmitter continues to sense the channel. The transmitter waits for an acknowledgment after transmitting the message. If an acknowledgment is not received before the timer expires, then the sequence re-starts. Another aspect of the invention is a fast scanning algorithm in which a next frequency is selected from a pre-determined set of frequencies.  The Received Signal Strength Indication (RSSI) at that frequency is then measured. When the measured RSSI is above a threshold, a first timer is started. A second timer is then started when bit synch has been achieved. A data packet is then read and validated. The sequence is repeated continuously. When a frequency is scanned and the RSSI is below a threshold, the method returns to selecting the next frequency. If the first timer expires and bit synch has not been detected, the method stops and returns to select the next frequency. The sequence also aborts and another frequency is selected if the data cannot be validated or there is no more data at the selected frequency. The invention provides apparatus and computer-readable instruction code for carrying out the fast-scanning method, and a system with aspects of both the transmitter and receiver of this invention.
Patent CA-2244761-A1 (CA)
Title: User-carried vacuum cleaner
Inventor: BERFIELD ROBERT C
IPC: A47L5/36
Filed: 1998-08-11
Abstract: A vacuum cleaner includes a backpack enclosure that removably encloses an impeller/motor unit. The backpack enclosure has a substantially block-shaped outer configuration and is made from a pliable cloth material, preferably composed of woven NYLON fibers. Two shoulder straps are attached to the backpack enclosure for carrying the vacuum cleaner. In accordance with an alternative embodiment of the invention, a vacuum cleaner includes a fanny pack enclosure that removably encloses an impeller/motor unit. The fanny pack enclosure is made from a pliable cloth material, preferably composed of woven NYLON fibers. A harness in the form of a waist strap is attached to the fanny pack enclosure for carrying the vacuum cleaner on the waist of a user.
Patent CA-2246070-A1 (CA)
Inventor: MEHTA NANDAN R
IPC: F16B39/286
Filed: 1998-08-28
Abstract: A lock nut threadably engageable and lockingly retainable about a threaded shaft extending through a workpiece, the lock nut having at least one deformable slot disposed on a side portion thereof and disposed transversely relative to the lock nut bore axis, the lock nut also having a nut deforming member protruding from a bottom end thereof, wherein at least a portion of the nut deforming member is in substantial axial alignment with the deformable slot. The lock nut is undeformed prior to installation thereof about the threaded shaft. The nut deforming member is engageable with the workpiece to deform the lock nut upon threadably installing the lock nut about the threaded shaft, thereby retaining the lock nut thereabout, whereby the lock nut has a relatively consistent torque performance with reduced statistical spread over several installation and removal cycles of the nut about the threaded shaft. The nut deforming member is an annular portion of the skirt disposed peripherally on the bottom end of the lock nut, which may have a substantially countersunk surface. The lock nut may alternatively include a spring washer rotatably coupled thereto.
Patent CA-2248575-A1 (CA)
Inventor: SHANE RICHARD MACFERRAN
IPC: B32B37/14
Filed: 1998-10-14
Abstract: A composite elastic material includes a layer of ribbon-shaped elastomeric elements disposed in machine direction alignment, bonded to an extensible layer which may be a gatherable layer or a stretchable layer. A layer of meltblown elastomeric fibers may be bonded to the layer of elastomeric ribbon-shaped elements before bonding to the extensible layer. The elastic composite has excellent cohesion, controlled breathability to air and water vapor. an opaque appearance. and is easy to cut and convert to end use products such as garments. pads. diapers, and personal care products where elasticity is desired.
Patent CA-2249030-A1 (CA)
Title: Catheter tracking system
Inventor: REX JAMES ALEXANDER
IPC: A61M25/095
Filed: 1998-10-16
Abstract: A catheter tracking system as depicted in Figure 1 for locating and tracking a catheter head 16 with reference to a part of the human or animal body 1. The catheter tracking system comprising a catheter 10 having a catheter head 16 which is arranged to be conveyed through the human or animal body to a desired location, a plurality of spaced apart transducers at least one of which is disposed on the catheter 18, and at least two further transducers are disposed at predetermined reference positions 19 in and/or around the human or animal body, and a signal processing unit 22 which operates to energise the plurality of transducers 18,19, and in accordance with a time of flight of signals between the reference transducers 19 and the transducer disposed on the catheter 18 to determine the location of the catheter head 16 with respect to the reference transducers. Said energised signals are such that they consist of predetermined waveforms which when analysed by said signal processing unit serves to increase an accuracy with which said catheter head location is determined.
Patent CA-2252147-A1 (CA)
Title: Method and system for sparing echo cancellers
Inventor: WINTOUR JUSTIN
IPC: H04B3/23
Filed: 1998-10-27
Abstract: A telephone communications switching system incorporating echo cancellers that may be replaced by other echo cancellers, and a method for replacing such echo cancellers are disclosed. The system comprises a control module for receiving and switching call data; and active and redundant echo cancellers. Under normal operation, an active echo canceller cancels echo in a call. A processor on the control module monitors the system and in the response to a sensed trigger event activates the redundant echo canceller and switches call data at the input of the active echo canceller to inputs of both the active and redundant echo cancellers. The processor then waits a determined amount of time; and thereafter disconnects the output of the active echo canceller from the control module and connects the output of the redundant echo canceller to the control module. By waiting, the processor allows the redundant echo canceller to become ready to cancel echo, before connecting the output of the redundant canceller to the control module. This may reduce the amount of time echo cancelling is not available for the call.
Patent CA-2252273-A1 (CA)
Inventor: SHEAFFER JOHN E
IPC: A01K1/035
Filed: 1998-10-30
Abstract: A dual-position lock for securing cages of different sizes in a ventilated cage and rack system.  The dual-position lock is comprised of a mounting shaft assembly consisting of a bracket having a shaft secured thereto with the shaft secured to the rack system.  A first retaining member, having a retaining tab disposed on one end, is rotatably mounted on the shaft adjacent to the bracket.  A second retaining member, having a retaining tab disposed on one end, is also rotatably mounted on the shaft.          The first retaining member and the second retaining member are matingly engaged for frictionally coupling the first retaining member to the second retaining member.  The first retaining member and the second retaining members can be matingly engaged in either of two locking positions for locking cages of different sizes in the rack system.
Patent CA-2255840-A1 (CA)
Inventor: PREWITT ART
IPC: G07F13/02
Filed: 1997-10-14
Abstract: A fuel dispenser system (12, 14, 24, 42, 66, 74) including a fuel dispenser (42) for dispensing fuel; a plurality of switches (40) connected to the fuel dispenser (42), the switches (40) utilized by customers for determining merchandise selected for sale; a plurality of graphic icons, each icon connected respectively to a switch (40); and a point of sale system (12, 66) connected to the fuel dispenser (42) to total the sale of both fuel and customer selected merchandise.
Patent CA-2256340-A1 (CA)
Title: Structures monolithiques a tolerance de defauts accrue
Inventor: TRITSCH DOUGLAS E
IPC: B64C27/48
Filed: 1997-04-24
Abstract: L'invention concerne un élément structural monolithique (10) conçu pour réagir aux charges M de moments de flexion vibratoires et constants sur un axe X de charges appliquées et présentant une section spécialement conçue pour permettre une tolérance de défauts accrue. Ladite section (10) comporte un élément central de liaison (18) et au moins une paire de nervures structurales (14a, 14b) formant partie intégrante de l'élément central de liaison (18) et saillant vers l'extérieur de ce dernier. Les nervures structurales (14a, 14b) sont, de plus, placées dans le champ de traction produit par la partie constante des charges de moments de flexion M et sont proximaux par rapport au centre de gravité C¿T? de la section (10). La section (10) définie par les nervures structurales et l'élément de liaison produit un rapport d'inertie partielle l¿x?/l¿y? supérieur ou égal 0 1,0, lequel rapport a pour effet avantageux de retarder ou de stopper la propagation des fissures dans l'élément structural (10). La configuration de la section (10), lorsqu'elle est destinée à un ensemble moyeu de rotor (50) d'hélicoptère, permet d'augmenter la tolérance de défauts et la garde entre les composants de l'ensemble moyeu de rotor. Spécifiquement, la section (10) a une forme de double té et est utilisée dans des zones correspondant à la section médiane (64m) de chaque étrier (64) d'ensemble rotor et aux segments de cisaillement (62) de l'élément de retenue (52) du moyeu. La section en double té (10) facilite les excursions hautes dans le sens du battement et de la traînée entre l'étrier (64) et l'élément de retenue du moyeu (52), ce qui permet une grande souplesse de conception et ou la réduction de la taille et du poids de l'ensemble moyeu de rotor (50).
Patent CA-2257362-A1 (CA)
Inventor: WANG XIU C
IPC: C07C213/04
Filed: 1997-06-18
Abstract: The hydroxy group of an epoxy-alcohol is selectively alkylated, without affecting the epoxy group, by reaction with an alkylating agent in the presence of a solvent and a strong base. As an example, Betaxolol (4) can be prepared according to scheme (1).
Patent CA-2258759-A1 (CA)
Title: Respiratory effort detection method and apparatus
Inventor: HAMMARGREN JOHN W
IPC: A61N1/36
Filed: 1997-06-26
Abstract: A method of predicting critical points in patient respiration includes monitoring at least one characteristic of a respiratory effort waveform of a patient to detect a respiratory event. A refractory period is defined that includes a hard refractory period during which time the respiratory event cannot be responded to and a soft refractory period following the hard refractory period. The respiratory event outside of the refractory period is detected as a function of a first set of predetermined parameters for the monitored at least one characteristic and the respiratory event within the soft refractory period is detected as a function of a second set of predetermined parameters for the monitored at least one characteristic. The respiratory event may be inspiration onset and the characteristic of the respiratory effort waveform monitored is at least one of slope and amplitude.  The refractory period may be defined based on detection of inspiration offset and further may be defined based on inspiration offset, an average respiratory period, and an average time of inspiration. Further, stimulation may be provided in response to a detected inspiration onset. Another method of predicting critical points includes sampling the amplitude of the respiratory effort waveform of a patient. A sample signal is generated representative of at least one characteristic of the respiratory effort waveform based on each amplitude sample. The sample signals representative of the at least one characteristic of the respiratory effort waveform are monitored and a respiratory event is detected as a function of at least two sample signals.  Apparatus and systems for use with such methods are also described.
Patent CA-2260701-A1 (CA)
Title: Method of preparing substituted quinazolin-4-ones
Inventor: CHENARD BERTRAND LEO
IPC: C07D401/06
Filed: 1999-02-05
Abstract: Disclosed is a process for the preparation of quinazolin-4-one derivatives of the structural formula (see fig. I) and the pharmaceutically acceptable salts and atropisomers thereof, wherein Ar is optionally substituted phenyl, R1 is halo, cyano, etc., R2 is hydrogen or hydroxyl, X is hydrogen, halo, etc., and Y is N or CH. The quinazolin-4-one derivatives prepared according to the method of this invention are .alpha.-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) inhibitors and are useful for the treatment of various neurologic disorders and conditions including Parkinson's Disease, epilepsy, emesis, eschemia, stroke, traumatic brain and spinal. cord injury, and so forth. The process comprises dehydration of the ethyl analog at position 2 of the quinazolin-4-one portion of formula I when R2 is OH, or oxidation of the ethyl analog when R2 is H.
Patent CA-2261159-A1 (CA)
Title: Thermoformable cast poly(methyl methacrylate)
Inventor: IRVINE DEREK JOHN
IPC: C08F265/06
Filed: 1997-07-25
Abstract: A curable composition capable of being cured to form a thermoformable cast poly(methacrylate) comprising at least from 95 % by weight of a syrup which is a solution of a poly(methacrylate) in a curable monomeric methacrylate, from 0.05 to 0.1 % by weight of at least one initiator capable of initiating the curing of the curable monomeric methacrylate, from 0.0001 to 0.0005 % by weight of a catalytic chain transfer agent which is or which is derived from a cobalt chelate, from 0.05 to 0.1 % by weight of a cross-linking agent; and optionally one or more of conventional additives selected from splitting aids, pigments, peak suppressors and stabilisers. A thermoformable sheet formed from such a composition and a thermoformed article produced from such a sheet. The thermoformable sheet does not need to be thermoformed at relatively high temperatures, has an acceptable Vicat Softening Point, does not emit unpleasant odours on heating and meets stringent industry standards.
Patent CA-2261437-A1 (CA)
Title: Ramp for vehicles
Inventor: CRAIK SIDNEY W
IPC: B60P1/43
Filed: 1999-02-09
Abstract: A ramp, for loading the box of a pick-up truck, has a pair of stringers and slidable rungs joined by lengths of chain. The stringers may be stored in storage tubes located on the box floor. The chains that join the rungs limit their separation when the ramp is extended.      The stringers are tethered to the storage tubes when deployed and the storage tubes are optionally tethered to the truck box.
Patent CA-2261958-A1 (CA)
Inventor: LI KENNETH
IPC: F21V8/00
Filed: 1997-07-25
Abstract: A method and apparatus for coupling high intensity light (82) to a low melting temperature optical fiber (80) which uses a high temperature, low NA optical fiber (84), a spatial filter between a source of high intensity light and a low melting temperature, low NA optical fiber. The source of light may be a high intensity arc lamp or may be a high NA, high melting temperature optical fiber transmitting light from a remote light source. The spatial filter not only allows the low, melting temperature optical fiber to be removed from the focus point of the high intensity light, but also dissipates unguided modes of light transmission before they enter the low temperature optical fiber. The spatial filter may be placed between the focus of a high intensity light source and a low melting temperature optical fiber, and alternatively may be placed between a high NA, high melting temperature optical fiber and a low temperature, low NA optical fiber. The source of high intensity light may be a direct source focused to a spot of less than 2 mm or alternatively may be from a second single fiber coupled to a high intensity light source. If the numerical aperture of the receiving fiber is less than that of the spatial filter, a spaced apart configuration is required with a mechanical heat sink (66) if the light intensity is higher than about 400 mW/mm2.
Patent CA-2264399-A1 (CA)
Inventor: BARTOLONE DEAN F
IPC: B60G7/02
Filed: 1999-03-04
Abstract: A lift axle assembly for supporting an auxiliary axle and wheels and selectively moving the auxiliary axle between in use and storage positions. The auxiliary axle is supported using two sets of upper and lower support arms pivotally connected between saddles attached to the axle and support hangers which are attached to the vehicle. Lift air springs selectively push the upper support arms vertically upwardly for rotating the support arms and placing the auxiliary axle in the storage position. The pivotal connections of the lower support arm as well as the pivotal connection of the upper support arm to the support hanger are of a bushing type allowing both rotational motion about the axis of rotation and coning for allowing twisting of the support arms about their longitudinal axes. The pivotal connection between the upper support arms and the saddles are of an antitwist type allowing pivotal motion about the axis of rotation but preventing coning or twisting of the upper support arms about their longitudinal axes.
Patent CA-2266766-A1 (CA)
Inventor: GUBELI ALBERT
IPC: E03D11/00
Filed: 1999-03-24
Abstract: The flushing means has a flushing water tank (10) with a closure (18), which is to be opened to trigger a flushing. The closure (18) is arranged at water outlet openings (26) of the toilet bowl (5, 35). The toilet ring of the toilet bowl (5, 35) can thus accommodate pelt of the flushing water needed for the flushing. The flush tank proper can thus be made substantially smaller and flushing will be less noisy, because air noises are avoided during the flow of flushing water into the toilet ring.
Patent CA-2270081-A1 (CA)
Title: Encrypting speech coder
Inventor: YOUTKUS DONALD JOSEPH
IPC: H04W12/02
Filed: 1999-04-22
Abstract: The present invention is an encrypting speech processor architecture that provides enhanced security without the use of external cryptosync and with minimal speech degradation. This is accomplished by incorporating a black encryptor (34) and a keystream generator (36) (instead of a fixed secret mask encryption scheme, such as those implemented in voice ciphers) for encrypting blocks of encoded speech bits at a transmitter side. The block encryptor (34) employs an invertible cryptographic algorithm and internal cryptosync to convert a first block of encoded speech bits into a first ciphertext block (output 34).  The first ciphertext block (output 34) is used to generate a keystream (output 36), which is then used to encrypt a second ciphertext block (FIG. 2).
Patent CA-2272487-A1 (CA)
Title: Distillation plant with a column and a heat pump
Inventor: MEILI ALBERT
IPC: F25B1/06
Filed: 1999-05-20
Abstract: The distillation plant comprises a column (1) and a heat pump (4,5) which operates between a sump vaporiser (3) and an exhaust vapour condenser (2) of the column. The heat pump is substitutable by devices (6, 7) which can be switched to the sump vaporiser and the exhaust vapour condenser when required.    These substituting devices comprise devices (6 and 7 respectively) for the production of vapour or the provision of a coolant respectively as well as connection means (63, 63', 72, 72'). The coolants can be liquids (water) or gases (air).
Patent CA-2276369-A1 (CA)
Inventor: BRAEGER DENISE M
IPC: A61F2/76
Filed: 1997-12-29
Abstract: La présente invention a trait à une unité d'insert prothétique destinée à amortir les chocs dans le domaine prothétique. Cette unité comprend d'abord un élément de fixation (150 notamment), un manchon inférieur (124' notamment), un support coulissant (152' notamment) pour permettre un libre mouvement réciproque entre ces composants, ensuite un élément élastomère de stockage d'énergie (124' notamment) placé à l'intérieur du manchon (124'), puis un piston (134' notamment) coopérant avec ledit élément élastomère afin de comprimer ce dernier, et enfin, un mécanisme antirotation. De préférence, ledit mécanisme est solidaire du support coulissant (152' notamment). L'élément élastomère permet à l'insert d'effectuer une flexion limitée et un mouvement d'amortissement. De préférence, on fournit un élément anti-encliquetage (269 notamment) afin de réduire au minimum l'encliquetage par contrecoup. On peut également inclure des éléments acoustiques (268 notamment) qui réduiront la transmission du bruit vers d'autres surfaces de l'insert.
Patent CA-2280086-A1 (CA)
Title: Microbial method for producing polyhydroxy alkanoates
Inventor: GEUTHER RUDOLF
IPC: C12N1/20
Filed: 1998-01-27
Abstract: The invention relates to a novel microbial method for producing polyhydroxy alkanoates by means of sterile aerobic fermentation of a bacterial microorganism on a liquid culture medium. Said method is characterized in that the strain Ralstonia eutropha (Alcaligenes eutrophus) DSM 11348 is used as the microorganism.
Patent CA-2281279-A1 (CA)
Inventor: ESCOBOSA MARCUS
IPC: H04N5/775
Filed: 1999-09-01
Abstract: A universal remote control system with bar code activated set up wherein the device to be controlled such as a TV, VCR or other consumer electronic product, and the associated remote control unit are pre-programmed and adapted to automatically reconfigure the remote control unit to communicate with a device to be controlled.
Patent CA-2281835-A1 (CA)
Title: System and method for disconnection and occlusion detection in a patient ventilator
Inventor: ISAZA FERNANDO J
IPC: A61M39/10
Filed: 1998-02-24
Abstract: The system (10) and method for detect-ing disconnection and occlusion of a tubing system (16) of a patient ventilator (12) detects disconnection of the tubing system (16), opens the exhalation valve, delivers an idle flow of breathing gas to the tubing system (16), dis-ables breath triggering, and generates an alarm.  A reconnection of the tubing system (16) can also be detected, to initiate resumption of pres-sure supported inspiration. For occlusion de-tection, the pressure drop in the tubing system is determined by pressure sensors (26, 36) in the inspiratory and expiratory airways (20, 18) of the tubing system (16). The two pressure drop values are compared, and once occlusion is detected, an alarm is generated, and the ven-tilator (12) responds to protect the patient (14) from over distension. Abatement of the occlu-sion can also be monitored in a pressure based occlusion status cycling mode, and the ventila-tor (12) can revert back to normal ventilation when either circuit occlusion or exhaust port occlusion are not detected.