Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 4194099 | Control panel overlay A flexible touch switch in which indicia and conductive contact portions are both formed on the undersurface of a flexible overlay that is transparent with respect to the indicia.... | 03/18/1980 |
| 4194097 | Membrane keyboard apparatus with tactile feedback There is disclosed a membrane-type keyboard comprising a support member, a pair of spaced-apart sheets of flexible insulating material having designated key portions positioned adjacent to and spaced from said support member and a pair of electrical condu... | 03/18/1980 |
| 4180711 | Desk-top calculator keyboard switch An electronic desk-top calculator includes a bottom casing for the calculator on the inner surface of which bottom casing there are provided fixed contacts, and a flexible plate having thereon pairs of contacts provided with wiring conductors therefor. Th... | 12/25/1979 |
| 4172216 | Pressure sensitive switch A resilient insulative layer of a plastic foam material is sandwiched between a dimpled carbon powder loaded plastic sheet and a resilient carbon powder loaded plastic foam pad. The dimples extend part way through holes provided therefor in the insulative... | 10/23/1979 |
| 4170104 | Switch mechanism for wristwatch A switch mechanism for a wristwatch having a case and a substrate mounted in the case, which comprises conductive contact means disposed on the substrate to be in registration with a switch position of the switch mechanism, stepped bore means provided in ... | 10/09/1979 |
| 4158115 | Internally connecting flexible switch A flexible touch switch with normally-conductive material inserted in apertures in a spacer layer, for making electrical contact between electrical pathways carried by contact-carrying layers.... | 06/12/1979 |
| 4145584 | Flexible keyboard switch with integral spacer protrusions A keyboard switch construction in which contacting surfaces in spaced apposition on resilient, flexible, electrically non-conductive laminae are prevented from making contact in the absence of outside pressure by ribs formed in the material and substantia... | 03/20/1979 |
| 4128744 | Keyboard with concave and convex domes Keyboard device having a top flexible plastic contactor sheet with a first circuit pattern thereon, said first pattern comprising contactors and circuit lines, a bottom sheet having a second circuit pattern comprising contacts and circuit lines, an insula... | 12/05/1978 |
| 4109911 | Gaming surface contact detecting systems A gaming surface contact detecting system for detecting the presence of a particular type of projectile upon touchdown of the projectile on any gaming surface or surfaces and for locating the position of touchdown of the projectile in relation to the gami... | 08/29/1978 |
| 4090045 | Keyboard strip switch assembly having multifurcated conductive screen contact with contact cleaning wiping-action A strip switch assembly or switch array formed in a flat configuration with minimal depth and of relatively small size wherein the array is formed of a number of individual switches and the switches are formed of components used in common, and wherein the... | 05/16/1978 |
| 4085302 | Membrane-type touch panel A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger... | 04/18/1978 |
| 4081898 | Method of manufacturing an electronic calculator utilizing a flexible carrier Electronic calculators are manufactured by use of a flexible insulative carrier, the carrier being a tape-like-plastic substrate a single length of which is sufficient to manufacture a plurality of the electronic calculators, wherein conductor patterns ar... | 04/04/1978 |
| 4074089 | Multiple push-switch apparatus having flexible element preventing simultaneous actuator depression The present invention relates to a multiple push-switch apparatus comprising an exclusion mechanism which includes a plurality of slidably supported operation bodies and a flexible body, any one of said plurality of operation bodies being able to move by ... | 02/14/1978 |
| 4071718 | Flat keyboard assembly having cover type membrane with protrusions to align switch components A flat keyboard assembly including a printed circuit board having conductors on one side thereof. Resilient dome switch elements are supported on the one side of the board in spaced-apart relationship in peripheral contact with certain conductors and adap... | 01/31/1978 |
| 4066850 | Keyboard switch assembly having interchangeable cover plate, indicating layer and actuator switch assembly in any operative combination A printed circuit keyboard assembly is disclosed comprising a waterproof jacket portion which includes a cover member overlying a sheet of raised key-tip portions, the jacket portion being releasably mounted to a position adjacent the waterproof switch ma... | 01/03/1978 |
| 4066854 | Membrane-type touch panel employing insulating grid anti-short means A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger... | 01/03/1978 |
| 4066853 | Membrane type touch panel employing piezoresistant anti-short means A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger... | 01/03/1978 |
| 4066851 | Keyboard switch assembly having foldable printed circuit board, integral spacer and preformed depression-type alignment fold Keyboard construction using a sheet of flexible and resilient non-conductive material preferably non-conductive plastic which is preformed in a predetermined manner for supporting both contact means and contactor means and which is adapted to be folded so... | 01/03/1978 |
| 4066852 | Membrane-type touch panel employing a photo-resist insulating grid anti-short means A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger... | 01/03/1978 |
| 4066855 | Vented membrane-type touch panel A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger... | 01/03/1978 |
| 4064688 | Touch sensitive electrode assembly for solid state wristwatches A front glass sheet having a viewing window and conventionally received within a casing of a solid state wristwatch, is made of electrically conductive glass material which manifests conductivity per se, for serving as one of the principal components of a... | 12/27/1977 |
| 4065649 | Pressure sensitive matrix switch having apertured spacer with flexible double sided adhesive intermediate and channels optionally interposed between apertures This is concerned with a switch device which is quite thin and can be used on either a flat or a contoured surface that includes a backing member which may be dimensionally stable, either as a flexible or a stiff membrane, with a flexible membrane spaced ... | 12/27/1977 |
| 4060705 | Pressure actuated continuous switch A pressure actuated continuous switch in the form of a cable having two coaxial wires, which form the contacts of the switch, separated by a helically wound strip of insulating material. The pitch of the turns of the helical material determines the sensit... | 11/29/1977 |
| 4035593 | Flexible pressure sensitive switch actuator module adaptable to a keyboard surface having fixed contact array A flexible, self-biasing switching element is disclosed herein for closing a circuit by flexing the element from an initial non-contacting position to a second contacting position and for opening the circuit by releasing the element and permitting it to r... | 07/12/1977 |
| 4034176 | Membrane switch apparatus A membrane switch in which a membrane layer is supported in a spaced relation from at least one contact of one or more pairs of electrically conductive switch contacts. The contacts are mounted on an insulated substrate. The membrane surface adjacent the ... | 07/05/1977 |
| 4028509 | Simplified tabulator keyboard assembly for use in watch/calculator having transparent foldable flexible printed circuit board with contacts and actuator indicia A tabulator keyboard of simplified design may be fabricated from a single flexible circuit and a minimum of other mechanical structures. The flexible circuit combines in one piece an array of deformable upper contacts, an array of stationary lower contact... | 06/07/1977 |
| 4022993 | Switch assembly having electrically illuminated character display devices between transparent actuators and switch arrays A switch assembly having a lighted display module for programmable character display where the module is an active part during switch actuation since the module is displaced by and transmits an applied switch actuating force. The switch assembly consists ... | 05/10/1977 |
| 4021630 | Hermetically sealed resilient contact switch having surgical applications A switching circuit is completed between electrical contacts by a flexible cap overlying the contact points. The cap is formed with cylindrical sidewalls and an upper end closure which has a plunger or piston-like portion extending therefrom towards the c... | 05/03/1977 |
| 4017697 | Keyboard membrane switch having threshold force structure A keyboard membrane switch including the standard three layer resilient flexible diaphragm switch construction. Threshold pressure is applied to the membrane prior to engagement of the membrane contact with at least one fixed contact. This phenomenon is a... | 04/12/1977 |
| 3987259 | Membrane switch apparatus having sequential bridging contact arrangement Membrane switch apparatus is disclosed, in its preferred form, as a keyboard including an insulator with an array of individual switching units located thereon. Each individual switching unit includes a plurality of first electrode members and a plurality... | 10/19/1976 |
| 3982089 | Pushbutton switch A pushbutton switch for electronic devices such as watches includes a housing provided with a cavity. A first electrically conducting contact member is mounted within the cavity on an electrically insulating portion of the housing. A diaphragm extends acr... | 09/21/1976 |
| 3959610 | Hermetically sealed keyboard type assembly with elastomeric electrical connecting link between switch and component modules A housing having key portions of a resilient pad extending therethrough with a metal impregnated elastomer pad overlying the rear surface thereof, a sheet of insulating material having openings therethrough corresponding with the key portions and a plural... | 05/25/1976 |
