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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 4323405 | Casing having a layer for protecting a semiconductor memory to be sealed therein against alpha particles and a method of manufacturing same A hermetic cap member of a casing for a semiconductor memory element is provided with a protection layer on a recessed surface facing the memory element. The protection layer is of at least one material which does not emit alpha particles and has a thickn... | 04/06/1982 |
| 4291499 | Propagation of plants A propagator for the cultivation of plants in a controlled environment comprising upper and lower elongate containers having a common perforated wall, a plurality of plant seeds supported in spaced relation by or adjacent the common wall, means for inject... | 09/29/1981 |
| 4292676 | Refresh cycle minimizer in a dynamic semiconductor memory A refresh circuit for a dynamic semiconductor memory wherein each access to the main semiconductor memory for the storage or retrieval of information is detected and recorded in an auxiliary memory. During each memory access, the memory row being accessed... | 09/29/1981 |
| 4284904 | Encapsulated magnetically sensitive circuit elements for depth-indicating purposes or the like The invention contemplates a unitary magnetically sensitive circuit element or network and a flexibly articulatable elongate assembly of a plurality of such elements or networks, with electrical interconnection of the same, such assembly being inherently ... | 08/18/1981 |
| 4284604 | Pipette with adjustable volume The subject of the invention is a pipette with an adjustable volume, wherein an upper stop bushing provided with inside threading is arranged around the piston shaft of the pipette in corresponding threading formed around said piston shaft. When the press... | 08/18/1981 |
| 4283733 | Semiconductor integrated circuit device including element for monitoring characteristics of the device A semiconductor device includes terminals for use in monitoring characteristics of circuit elements formed therein. The terminals are formed of a layer of polycrystalline silicon and terminate in an enlarged area pad portion adapted to be contacted by a p... | 08/11/1981 |
| 4272165 | Optical system for illuminating the ground of the eye The invention contemplates an improved optical system for illuminating the retina or ground of the eye and having particular application to a hand-held ophthalmoscope. The optical system, thus embodied, permits selective modification of image scale, for a... | 06/09/1981 |
| 4270961 | Method of manufacturing a sealed cable employing an extruded foam barrier An improved method for producing sheathed cable which includes an inner insulated conductor/conductor group, an outer corrugated metal sheath, and a barrier layer of a closed-cell foam disposed therebetween to prevent the passage of gas or vapors via the ... | 06/02/1981 |
| 4269537 | Revetment unit An improved revetment construction is provided. Each individual revetment unit has a base section and legs extending from its corners, the legs and base sections are so constructed and arranged that the individual units when placed in array interlock with... | 05/26/1981 |
| 4269135 | Hydroplanes A hydroplane boat hull of cylindrical-ellipsoidal form formed from sections each having internal flanges formed around the edges thereof, the abutting flanges of the sections being secured together to form the hull and at the same time the flanges forming... | 05/26/1981 |
| 4269638 | Method of manufacturing a sealed cable employing a wrapped foam barrier An improved method for producing sheathed cable which includes an inner insulated conductor/conductor group, an outer corrugated metal sheath, and a barrier layer of a closed-cell foam disposed therebetween to prevent the passage of gas or vapors via the ... | 05/26/1981 |
| 4268885 | GFI Sensor circuit In an electronic module for a ground fault interrupter the portion that amplifies a sensed ground fault signal is in the form of a series of cascaded CMOS inverter stages. The electronic module also includes an additional CMOS inverter providing a balance... | 05/19/1981 |
| 4268481 | Pipette A pipette comprising a frame portion shaped as a handle, inside which a cylinder is formed as well as a piston fitted into the cylinder by means of a seal ring, a piston rod connected to the piston, and a press knob with shaft fitted to the upper end of t... | 05/19/1981 |
| 4266533 | Modification of the growth, repair and maintenance behavior of living tissues and cells by a specific and selective change in electrical environment Surgically non-invasive method of and apparatus for altering the growth, repair and maintenance behavior of living tissues and/or cells by inducing voltage and concomitant current pulses of specific time-frequency-amplitude relations therewithin.... | 05/12/1981 |
| 4266532 | Modification of the growth, repair and maintenance behavior of living tissues and cells by a specific and selective change in electrical environment Surgically non-invasive method of and apparatus for altering the growth, repair and maintenance behavior of living tissues and/or cells by inducing voltage and concomitant current pulses of specific time-frequency-amplitude relations therewithin.... | 05/12/1981 |
| 4266862 | Refractometer for the automatic objective determination of the refractive condition of an eye The invention contemplates a refractometer that images a test mark on the retina and is automatic in its determination of both refractive-power and astigmatism parameters, for the eye under examination. An imaging lens serves both (1) to project the test ... | 05/12/1981 |
| 4267149 | Evaluation instrument for automatic photometric analysis of liquid samples The invention contemplates instrumentation to enable performance of a plurality of automatic photometric analyses upon liquid samples, as in different analyses of such body fluids as blood, urine, etc. Prior to photometric evaluation, the liquid samples a... | 05/12/1981 |
| 4266691 | Continuous automatic feeding apparatus Continuous automatic feeding apparatus for bulk material is provided. The device has a vibratory feeder for moving the material to be fed, the feeder having a centrally disposed narrow spoon extending therefrom which provides a relatively small rate of ma... | 05/12/1981 |
| 4266663 | Surgical drape for an operating microscope The invention contemplates a disposable surgical drape of pliable elastomeric film, precut and seamed for sterile packaging and instant readiness to assemble to a microscope head, with assurance of microscope sterility during surgical procedures. The drap... | 05/12/1981 |
| 4265620 | System for simulating the condyle movements A system for simulating the condyle movements, for use in forming dental protheses, comprises a sensing apparatus including structures engageable with the cranium and mandible arch, and a reproducing apparatus which repeats the mastication movements sense... | 05/05/1981 |
| 4265513 | Light switch A multichannel light switch including a cylindrical-shaped light-focusing transmission body having a length equal to an odd multiple of one quarter of the pitch of light beam undulation within the body and having a total reflection coating applied to one ... | 05/05/1981 |
| 4266239 | Semiconductor device having improved high frequency characteristics A semiconductor device in which a conducting shielding member is disposed over the space between the input and output terminal metal layers and over the semiconductor chip bonded to the output metal layer. The shielding member is electrically connected to... | 05/05/1981 |
| 4264122 | Binocular observation instrument The invention contemplates a binocular observation instrument wherein two viewing tubes are pivotally connected for articulation about a first axis to adjust for interpupilary distance and wherein provision is made for further articulation about a second ... | 04/28/1981 |
| 4264121 | Binocular telescope The invention contemplates a binocular-telescope construction wherein no precision optical alignment or realignment procedures are needed within the telescope tubes, once the telescope tubes are assembled to their connecting bridge structure. The nature o... | 04/28/1981 |
| 4263148 | Process for removing humic matter from phosphoric acid solutions A process is disclosed for removing colloidal and non-colloidal humic matter from an aqueous solution of phosphoric acid, the process comprising (a) treating the phosphoric acid solution with a flocculant to flocculate the humic matter, (b) adding to the ... | 04/21/1981 |
| 4262991 | Mechanical stage for microscopes A mechanical stage for microscopes includes a base plate, a stage plate displaceable along the base plate in one coordinate direction, and an object plate displaceable along the stage plate in a second coordinate direction and includes means for automatic... | 04/21/1981 |
| 4263353 | Flame spray powder mix A flame spray powder mix is provided for producing metal coatings on metal substrates, such as ferrous metal substrates, e.g., steel, case iron, among other metal substrates, the powder mix comprising particles of at least one metal silicide, e.g., titani... | 04/21/1981 |
| 4261484 | Non-return valve unit with drip prevention and controlled discharge A non-return valve unit for a bottle having a mechanism for preventing dripping and for giving a controlled discharge of liquid from the bottle, suitable for use with any type of bottle neck by insertion in the said neck and especially for bottles adapted... | 04/14/1981 |
| 4259290 | Transfer device for analysis equipment The subject of the present invention is a transfer device for analysis equipment, which transfer device comprises a track consisting of, inter alia, guide and support rails on which to transfer a pit plate on a transport cassette along the track. The tran... | 03/31/1981 |
| 4257614 | Record players A speed change device for a record player which has a belt drive engaged with a drive pulley on the turntable and with a stepped pulley driver by an electric motor, having a pivotally mounted, belt engaging arm which is acted on by cam means to move the a... | 03/24/1981 |
| 4257444 | Insert check valve or the like The invention contemplates a particular body construction and assembly for a check valve or the like whereby the entire valve assembly may be readily installed as a unit within the bore of standard pipe or conduit, or a standard fitting therefor. A single... | 03/24/1981 |
| 4257521 | Packaging means for an intraocular lens The invention contemplates an autoclavable mounting and package for an intraocular lens of the variety which is an assembly of a lens element and one or more lens-retaining haptic elements. The mounting in a preferred form comprises a single stiffly compl... | 03/24/1981 |
| 4257110 | Recognition memory with multiwrite and masking An improved associative memory employs plural separately addressable memories, e.g., random access memories (RAM's), which may be written into, or read from in conventional fashion. In a recognition mode, information is read from differing memory location... | 03/17/1981 |
| 4255820 | Artificial ligaments An improved artificial ligament is tubular in overall configuration with flared ends, which have a graduated pore density to permit controlled hard and soft tissue ingrowth, and a central portion which prevents tissue ingrowth. The central section of the ... | 03/17/1981 |
| 4253498 | Travelling wave shedding looms relative to the shuttle loading system A travelling wave shedding loom has a plurality of devices for winding and loading shuttle bobbins. One such device is provided for each shuttle, and the respective devices move with their associated shuttles around a continuous path within the loom.... | 03/03/1981 |
| 4254244 | Light-sensitive materials A light sensitive material suitable for coating onto a support to produce a light sensitive plate for use in, for example, the manufacture of a printing plate comprises groups of the formula: ##STR1## attached to carbon atoms, wherein ##STR2## ... | 03/03/1981 |
| 4250888 | Heartbeat monitoring process and device A process for the electronic long-time monitoring of the heart with EKG lead electrodes fastened to the skin of a patient, in which the signal delivered by these electrodes is digitized and evaluated, the process being characterized by the fact that the E... | 02/17/1981 |
| 4249567 | Check-valve construction The invention contemplates a combined closure spring and upstop having particular application to check valves having multiple valve members. The invention is illustrated by one embodiment involving two valve members hinged on a single axis oriented diamet... | 02/10/1981 |
| 4249272 | Intraocular lens The invention contemplates improved intraocular-lens structures for use as implants in ophthalmological surgery, the lens being a replacement for a cataract-clouded natural lens, and the replacement being installed through the pupil at the iris as the ope... | 02/10/1981 |
| 4249271 | Intraocular lens The invention contemplates improved intraocular-lens structures for use as implants in ophthalmological surgery, the lens being a replacement for a cataract-clouded natural lens, and the replacement being installed in the pupil at the iris as the operativ... | 02/10/1981 |
