William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 5983949 | Non-alpha-numeric coding of long flexible items A long flexible member which is subject to tangling is provided with a non-alpha-numeric code such as a color, textural, or design code, which code is used as an aid in untangling the item by providing a rough estimation of separation of sections along th... | 11/16/1999 |
| 5936556 | Keyboard for inputting to computer means This novel computer input system consists of a keyboard with gojyuon-based key arrangements and software that is used in conjunction with the keyboard. The novel key arrangement of the keyboard of this invention uses the basic characteristics of the gojyu... | 08/10/1999 |
| 5699879 | Elevator system An elevator system is shown that includes an elevator shaft (12) in which an elevator car (C) is movable along vertical axis (14). Car (C) is connected by drive ropes (26-1 through 26-4) to counterweight (CW) movable along vertical axis (20). A drive moto... | 12/23/1997 |
| 5663538 | Elevator control system An elevator system for a multistory structure having a plurality of elevator shafts is shown which includes at least one independently movable elevator car in each elevator shaft. A digital computer with memory is used to control elevator cars including t... | 09/02/1997 |
| 5584364 | Elevator system An elevator system is shown which includes first and second horizontally spaced elevator shafts. First and second independently operated elevator cars are located in the first shaft, and third and fourth elevator cars are located in the second shaft. The ... | 12/17/1996 |
| 5419414 | Elevator system with multiple cars in the same hoistway An elevator system is shown that includes an elevator shaft (12) in building (10) and a plurality of elevator cars (C1, C2 and C3) that are movable up and down within the shaft along vertical axis (20). The elevator cars a... | 05/30/1995 |
| 5405300 | Mechanism for intermittent rotation of first and second shafts and continuous rotation of a third shaft A rotary piston engine (20) is shown which includes a housing (22) having a cylindrical working chamber with inlet (56) and exhaust (54) ports. First and second piston assemblies (30 and 32) each of which includes at least one pair of diametrically oppose... | 04/11/1995 |
| 5381766 | Rotary piston engine A rotary piston engine (20) is shown which includes a housing (22) having a cylindrical working chamber with inlet (56) and exhaust (54) ports. First and second piston assemblies (30 and 32) each of which includes at least one pair of diametrically oppose... | 01/17/1995 |
| 5357962 | Ultrasonic imaging system and method wtih focusing correction Ultrasonic imaging apparatus and method are shown which include electronic correction of focus defects produced by acoustic refractive index inhomogeneities within an object (14) being imaged. The region of interest (38) within which focus correction take... | 10/25/1994 |
| 5316779 | Foam-limiting drinking cup and method A container (8) which includes a disposable cup (10) is shown, together with a coating (12) of food-grade antifoaming agent at the inner surface of the cup. A method of speeding filling of the container is disclosed which includes pouring a beverage that ... | 05/31/1994 |
| 5311182 | Method and apparatus for regenerating a distorted binary signal stream Apparatus is shown for regenerating a signal stream of binary digits which has been distorted by intersymbol interference during passage through a channel (10 and 12) having insufficient channel bandwidth such that the channel output waveform comprises su... | 05/10/1994 |
| 5280169 | Method and apparatus for limiting optical radiation intensity at an optical sensor using solid particles oscillating in an electric field Method and apparatus for limiting optical radiation to an optical sensor are disclosed for protecting the sensor against damage from high intensity optical radiation. A fixed electric field is established between a pair of spaced electrodes by connection ... | 01/18/1994 |
| 5261386 | Portable charbroiler and method A portable charbroiler (20) is shown that includes a bottom member (24) and sidewalls (26,26 and 28,28) of thermally insulating ceramic material that form an enclosure. Air inlet slots (30) are located along the bottom edges of the sidewalls, and an outle... | 11/16/1993 |
| 5263124 | Method for producing a binary tree, pattern recognition and binary vector classification method using binary trees, and system for classifying binary vectors A binary tree and method of producing a binary tree are shown, together with artificial neural networks which include processing units of binary trees. The binary tree-producing method includes obtaining a set of binary training pattern vectors some of wh... | 11/16/1993 |
| 5257194 | Highway traffic signal local controller A highway traffic control method is shown in which the control method (80) and phasing scheme (82) are defined and recall switches are set (84) every cycle of operation. In time-of-day control methods (FIGS. 14 and 15) timing parameters (86) also are defi... | 10/26/1993 |
| 5154178 | Method and apparatus for obtaining in-vivo NMR data from a moving subject Apparatus for obtaining in-vivo nuclear magnetic resonance data from a moving joint of a patient for imaging or spectroscopic purposes is shown which includes a support (10) for support of the patient's hand and lower arm (12). Support (10) includes a sta... | 10/13/1992 |
| 5152254 | Internal combustion engine for vehicles An internal combustion engine (20) which includes an oscillating piston (52) and rotary valves (34) and (36) is shown. Oscillating movement of piston shaft (50) is transmitted to oscillating idler shaft (66). Outer and inner coaxial shafts (82) and (84) a... | 10/06/1992 |
| 5133317 | Rotary piston engine A rotary piston engine is shown which includes a housing (22) having a cylindrical working chamber with inlet (88) and exhaust (86) ports. First and second piston assemblies (30 and 32) each of which includes at least one pair of diametrically wedge-shape... | 07/28/1992 |
| 5065763 | Combined reflection and transmssion untrasonic imaging method and apparatus An ultrasonic imaging system and method are shown which includes a transducer (10) for pulse insonification of an object (12) and for receiving echo signals from within the object. Echo signals are converted to electrical signals at the transducer (10) an... | 11/19/1991 |
| 5004311 | Beam scanning method and apparatus Beam scanning method and apparatus are shown comprising a cylindrical mirror upon which a focused beam is directed through the focus of the cylindrical mirror. The axis of the focused beam is pivoted about the focus of the cylindrical mirror for scanning ... | 04/02/1991 |
| 4958648 | Hair roller and heat source therefor A hair roller assembly is shown which includes a hollow roller member (12 and 60) containing a consumable heat source (14 and 62). The heat source is slidable into and out of engagement with the roller member such that, after use, the heat source may be r... | 09/25/1990 |
| 4935905 | Method and apparatus for seismic exploration A geophone is disclosed which includes at least two transducers having axes which are perpendicular to each other for generating Cartesian coordinate signal components in response to at least vertical and horizontal in-line seismic wave motion of the geop... | 06/19/1990 |
| 4921660 | Golf club with stroke guiding device A golf guide for a golf club is shown which includes an obtuse isosceles triangular shaped member comprising visible line segments. The guide is attached to the golf club with the vertex of the triangular shaped member located at a point on a vertical pla... | 05/01/1990 |
| 4921393 | Articulatable structure with adjustable end-point compliance A manipulator is disclosed which includes first and second interconnected limb sections, the second section of which is elongated and flexible in at least one direction normal to the longitudinal axis. The first limb section is connected to a base, and th... | 05/01/1990 |
| 4901694 | Rotary engine A rotary engine includes separate compressor and combustion sections which are interconnected. Each section includes a cylinder formed with a cylindrical working chamber containing a pair of pistons rotatable about the cylinder axis. The pistons are attac... | 02/20/1990 |
| 4882754 | Data compression system and method with buffer control In a digital encoder, truncation is controlled by the fullness of the output rate-smoothing buffer. A signal compression system is shown for processing a stream of fixed length digital sample signals, such as audio signals, which system includes a linear ... | 11/21/1989 |
| 4862892 | Ultrasonic reflex transmission imaging method and apparatus with artifact removal A reflex transmission ultrasonic imaging system and method are shown which include a transducer (10) for pulse insonification (14) of an object (12) and for receiving echo signals from within the object. Echo signals are converted to electrical signals at... | 09/05/1989 |
| 4841299 | Method and apparatus for digital encoding and decoding Encoding and decoding method and apparatus are disclosed including a decoder for decoding a stream of encoded digital data words which have been encoded by an encoder using variable length code words in which the code words comprise a single group of 0 bi... | 06/20/1989 |
| 4830583 | Fluid motor-pumping apparatus and system A fluid pump is shown which includes integral valve and cylinder housings. The cylinder housing is formed with axially aligned cylinders. Axially movable pistons are located in the cylinders, which pistons are interconnected by a piston rod extending thro... | 05/16/1989 |
| 4826194 | Two-wheel vehicle with auxiliary support system An auxiliary side wheel assembly for use with a two wheel vehicle, such as a motorcycle, is shown which includes right and left arms at opposite sides of the vehicle which arms are attached to a connecting shaft extending transversely of the vehicle. The ... | 05/02/1989 |
| 4819654 | Method and apparatus for diagnosis of coronary artery disease Method and apparatus for recurrently obtaining a measure of the systolic slope of the blood pressure wave in a subject's artery during a range of physical activity, or exercise, are disclosed. A plot, or record, of the slope measurements versus heart beat... | 04/11/1989 |
| 4818649 | Method for intensification and reflective read-out of underexposed film, radiographs, and the like Method and apparatus for intensification and reflective read-out of underexposed films, radiographs, and the like are shown which include means for converting a metallic silver particle image to a highly reflective image. The film containing the highly re... | 04/04/1989 |
| 4818914 | High efficiency lamp A high efficiency lamp is shown which includes an evacuated envelope, at least a portion of which is light-transmitting. A phosphor layer and anode electrode in engagement therewith is provided at the light-transmitting portion of the envelope. A field em... | 04/04/1989 |
| 4802488 | Blood pressure monitoring method and apparatus Intraarterial blood pressure is measured noninvasively by an electromechanical transducer (22) that includes an array of transducer elements (22-1 through 22-19). The transducer extends across an artery (24) with transducer elements at the ends of the arr... | 02/07/1989 |
| 4802222 | Data compression system and method for audio signals Audio signals such as ECG, speech and music are digitally processed to reduce the bit-rate needed for accurate transmission, known as minimizing the entropy of the signal. The transmitter features a digital compression filter with zeros restricted to cert... | 01/31/1989 |
| 4799491 | Blood pressure monitoring method and apparatus Intraarterial blood pressure is measured noninvasively by an electromechanical transducer. The correct hold-down force to be applied to the transducer for obtaining accurate blood pressure measurements is determined by obtaining a set of at least one of t... | 01/24/1989 |
| 4778326 | Method and means for handling semiconductor and similar electronic devices Method and apparatus for handling semiconductor chips and the like are disclosed which include the use of a flat flexible film which is attached to the face of a base member. The face of the base member is formed with recesses covered by the flat flexible... | 10/18/1988 |
| 4768534 | Portable cleaning apparatus A portable cleaning apparatus for cleaning dishes, vegetables, fish, or like items, is disclosed comprising a base, or tray, and removable hood or cover supported thereon to form a cleaning chamber. An inlet opening is formed at the top of the hood throug... | 09/06/1988 |
| 4754483 | Data compression system and method for audio signals A data reduction system is disclosed which includes an analog to digital converter for converting an analog signal to digital sample signal form, a digital compression filter for compression filtering the digital sample signals, and an encoder for truncat... | 06/28/1988 |
| 4730495 | Ultrasonic reflex transmission imaging method and apparatus A reflex transmission ultrasonic imaging system and method are shown comprising an ultrasonic transducer array of either a two dimensional or linear type acoustically coupled to a subject. An ultrasonic energy beam is transmitted by the array into the sub... | 03/15/1988 |