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...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 6988910 | Handle accessory for a mobile station and method of using the same The present invention addresses the above needs and achieves other advantages by providing a mobile station of the present invention. The mobile station includes a wireless telecommunications signal processing assembly contained within a housing. In addition, the mo... | 01/24/2006 |
| 5894175 | Photo-control apparatus and circuit A photo-control apparatus comprising a photo-control circuit that includes two or more photo-cells connected in parallel that respond to ambient light. The circuit includes a switch that connects a power source to a load. When the photo-cells are exposed ... | 04/13/1999 |
| 5596477 | Contactless signaling device A contactless signaling device for operating a horn or bell is disclosed. The signaling device has an electro-magnetic coil which drives an armature. A light source is positioned opposite a light sensor and a shutter portion of the armature moves between ... | 01/21/1997 |
| 4707780 | Method and apparatus for reducing track errors in computer controlled machine tools or industrial robots In a computer-controlled machine tool, an auxiliary filter is inserted into the reference value channel of the drive control circuit, which filter has a transfer function approximately the inverse of that of the corresponding drive control circuit.... | 11/17/1987 |
| 4589620 | Seat with an air suspension An improved seat with an air suspension is disclosed in which detector means, a control circuit and electromagnetic valves are cooperatively used to operate the air suspension so as to automatically control the amount of air to be contained within the air... | 05/20/1986 |
| 4310836 | Photoelectric barrier, particularly useful as an accident-preventing device in machine tools A photoelectric barrier comprises an emitter emitting a movable modulated beam which scans periodically at a high rate an area to be protected. The beam is then redirected to a photoelectric receiver supplying the signal deactivating the machine controls.... | 01/12/1982 |
| 4292541 | Safeguard or lock device A device for safeguarding an engine against unauthorized use, the device including a unit structure for housing the engine starter, the starter mechanism switch and a code signal receiver therein to prevent access thereto. The code signal receiver include... | 09/29/1981 |
| 4242831 | Toy apparatus with photoemissive motor control system A toy apparatus with a photoemissive motor control system includes a chamber into which a phosphorescent member is placed, whereupon photoemission acts upon a photosensitive element to activate a motor control circuit for operation of a motor which drives... | 01/06/1981 |
| 4081729 | Low voltage photoswitch A light responsive toy comprising a housing, such as in the form of a mechanical robot, which has a first photocell that is connected to the relay of a double polarity motor which is geared to suitable means to drive the toy along a first path when light ... | 03/28/1978 |
| 4021832 | Photocell control device for a photographic film processor A method and a processor having infrared sensed chemical replenishing system for processing photosensitive material. The processor includes a replenishing circuitry having a power supply; a pulsed infrared sensor electrically connected to the power supply... | 05/03/1977 |
| 3993569 | Photoelectrically triggered timing circuit for controlling electrically responsive load apparatus in response to alternate light changes A combination timer and photoelectrically activated control circuit to selectively repeat a timed electromechanical operation at dawn and/or dusk in response to sunrise and/or sunset conditions. Said photoelectric control timer being provided with a deact... | 11/23/1976 |
| 3989943 | Angularly adjustable optical switch assembly A selectively aligned optical switching device including two adjacent translucent discs having mask segments formed on the surfaces thereof, with the first disc including a sleeve extending from the central opening thereof which is received within the cen... | 11/02/1976 |
