Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4302224 | Compact oxygen concentrator A machine for concentrating the oxygen in air for medical purposes utilizing any pressure swing adsorption (PSA) technique and comprising a combination of features to provide a light weight, reliable and compact device, especially suited for home use.... | 11/24/1981 |
| 4285337 | Surgical arm-sling with improved strap adjustment An arm sling made of denim and of attractive design with an outside utility pocket, having an infinitely adjustable strap length, and permitting repeated opening and closing without disturbing the adjusted strap length.... | 08/25/1981 |
| 4263018 | Pressure swing adsorption process and system for gas separation A pressure swing adsorption process and system including at least two adsorption beds and a segregated storage adsorption bed which is isolated from direct communication with the feed gas stream. During the process the pressures in the adsorption beds are... | 04/21/1981 |
| 4262641 | Combined RPM limiter, and electronic tachometer with shift point indicator A multi-function device using two ICs, with the precision ignition pulse frequency-to-voltage converted signal produced in the RPM portion being used as input to both ICs. Chatter pulses produced by an operational amplifier in the RPM limiter are utilized... | 04/21/1981 |
| 4222284 | Selector pin assembly for manual transmission shifter An improved selector pin assembly for automotive transmission shifters of the type where the main shifter lever carries the selector pin. The improved structure comprises a pair of side slats joined at their ends by hollow sleeves, the assemblage being he... | 09/16/1980 |
| 4222260 | Warm forging of connecting rod caps Rod end caps and the method of forming same comprising the steps of using a flashless, closed die set, a predetermined shape and volume billet, warm forging temperatures, and a unique ejector. The ejector pin defines part of the mold cavity when retracted... | 09/16/1980 |
| 4222131 | Hook type fowler for hospital stretchers A quick release for the back rest (Fowler) of hospital stretchers. The conventional threaded crank actuator carries a mating threaded block and a sliding block, the sliding block being connected to the head rest. Manually operated hook means permits disen... | 09/16/1980 |
| 4194890 | Pressure swing adsorption process and system for gas separation A pressure swing adsorption process and system including at least two adsorption beds and a segregated storage adsorption bed which is isolated from direct communication with the feed gas stream. During the process the pressures in the adsorption beds are... | 03/25/1980 |
| 4181364 | Strengthening means for decorative automotive wheel centers The invention is applicable to automotive wheels which comprise a rim and a center, where the center comprises a "knuckle" or bent over portion, and comprises various forms of strengthening members on the rear side of the knuckle.... | 01/01/1980 |
| 4165904 | Wheel adaptor device An adaptor bolt to permit fitting wheels having a given bolt hole circle diameter to wheel studs having a different circle diameter. The kit is made up of a plurality of adaptor bolts each comprising an internally threaded bore located eccentrically in th... | 08/28/1979 |
| 4141331 | Breakerless capacitive discharge ignition system A breakerless capacitive discharge ignition system is provided for use in connection with a magneto power supply. A time delay circuit is provided to delay discharge of the capacitor until it is completely charged by a pulse of electrical energy being emi... | 02/27/1979 |
| 4119403 | Method and apparatus for temperature controlled samplers The invention pertains to "wet chemistry" analytical devices for pollutant gases in air. Numerous improvements are provided including a thermo-electric heating/cooling device which uses the atmosphere as a heat sump. Critical flow means to maintain consta... | 10/10/1978 |
| 4119151 | Casing slotter A drill string mounted tool for cutting a pair of spaced, vertical slots in well tubular goods comprising a pair of knives adapted to be swung outwardly, scissors style, by a piston member, which is in turn operated by well fluid pressure from the surface... | 10/10/1978 |
| 4033413 | Wire line well tool and method A new and improved wire line operated well tool apparatus and method utilizing a downhole transformer for sensing and testing conditions in a well, such as temperature, incline, and the like.... | 07/05/1977 |
| 4002829 | Autosynchronous optical scanning and recording laser system with fiber optic light detection Apparatus and methods for making displays, printing plates, electrical circuit boards, and generally reproductions of originals in reduced, enlarged or full size comprising generating a collimated beam of interrogating light; optically deviating and raste... | 01/11/1977 |
| 3994163 | Stuck well pipe apparatus A new and improved wire line operated well tool apparatus and method for sensing and testing conditions in a well, such as stuck drill pipe, and for performing certain operations in the well, such as backing off, or loosening, the stuck pipe.... | 11/30/1976 |
| 3993357 | Wire wheel Automobile wheel with wire spokes accessible through a recess in the outer spoke band adjacent the drop center of the rim, thus permitting use of tubeless tires.... | 11/23/1976 |
| 3973179 | Modular cordless tools Cordless electric tools or the like comprising a power handle and a plurality of diverse tool heads detachably securable thereto. The power handle includes battery means therein and operator controlled switch means, whereas each of the diverse tool heads ... | 08/03/1976 |
| 3964987 | Electroplating apparatus The invention relates to a process for making a nickel/chromium plated automobile wheel comprising plated rim and plated center, including special electroplating procedures and apparatus; and the resulting wheel.... | 06/22/1976 |
| 3956824 | Cordless electric grass shear having improved blade system A battery powered grass shear having improved upper and lower shear blades with improved cutting and durability characteristics and which require less power to operate. The lower shear blade, which is fixed to the housing of the battery powered grass shea... | 05/18/1976 |
| 3956673 | Printed circuit modules cooled by rack with forced air An improved cooling system wherein printed circuit cards are made into modules of two cards each with an enclosed space between them inside the module. The modules cooperate with a rack which carries air passages, and upon connection of the module into th... | 05/11/1976 |
| 3952239 | Modular cordless tools Cordless electric tools or the like comprising a power handle and a plurality of diverse tool heads detachably securable thereto. The power handle includes battery means therein and operator controlled switch means, whereas each of the diverse tool heads ... | 04/20/1976 |
| 3949958 | Pitch control system An improved system of pitch control for aircraft having a "flying tail"; i.e., a movable horizontal stabilizer with at least one movable elevator thereon. The human or automatic pilot input commands operate the elevators, and then the elevator response is... | 04/13/1976 |
| 3939321 | Portable electrical discharge metalworking machine A compact, portable electrical discharge metalworking machine for off-hand use and general applicability. The invention is a lightweight, versatile gun type tool which has air and water cooling of electrode and work, a vibrating electrode to facilitate it... | 02/17/1976 |
