Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4991188 | Digital frequency divider A digital frequency divider capable of providing output pulses of frequency fout related by Y/X to the frequency of the input pulses fin, where X and Y are positive whole numbers and O | 02/05/1991 |
| 4860357 | Binary autocorrelation processor A system for converting known speech segments into machine storable binary signals for the purpose of later attempting a match between a stored signal and an incoming signal using autocorrelation techniques. Through the use of a clipper and a sample and h... | 08/22/1989 |
| 4680572 | Chord entry keying of data fields A keyboard system for chord entry keying of alphanumeric data fields includes decoding logic permitting substantially or near-simultaneous depression of numeric or alpha data keys and entry or function keys. The logic provides a decoding algorithm for res... | 07/14/1987 |
| 4517470 | High frequency inverter A pulse width modulated D. C. to A. C. inverter circuit includes a first set of MOSFETS operated at a line frequency for transmitting high frequency clock pulses to a second set of MOSFETS for outputting a D. C. signal derived from a D. C. source. The inv... | 05/14/1985 |
| 4516035 | Phase synchronization and control circuit A circuit for generating control signals used in detecting a power failure in an uninterruptible power supply in which the A.C. signals of the power supply are examined to output a first signal representing the zero crossing of the A.C. signals. This firs... | 05/07/1985 |
| 4513420 | Error detecting system A method and apparatus for storing data in which the data is checked for an error without requiring the data to include an error correction code. Included in the system is a logic circuit for dividing a data word by a polynomial during the time the data w... | 04/23/1985 |
| 4513389 | ROM security circuit A control circuit to disable the operation of a semiconductor microprocessor memory device in the event of an unauthorized attempt to access the memory. A logic circuit generates a control signal in response to receiving a predetermined binary bit pattern... | 04/23/1985 |
| 4512940 | Method and apparatus for the production of electret material An electret material is formed by the method which includes the step of passing a pair of electrical conductor elements along the surface of a dielectric material heated to a predetermined temperature. The conductor elements are supported between a pair o... | 04/23/1985 |
| 4509817 | Method for correcting volume-phase-gelatin holograms Bragg's angle deviation The Bragg's angle deviation of volume-phase-gelatin holograms is corrected by increasing the water content of the developed hologram and then reducing the water content of the hologram until the Bragg's angle deviation is zero.... | 04/09/1985 |
| 4510221 | Process for making high efficiency phase holograms A method for producing a phase hologram having a high diffraction efficiency which includes treating a developed photographic material with a stop bath containing sodium sulfate, bleaching with a tanning bleach having a low pH value and fixing the bleache... | 04/09/1985 |
| 4506365 | Error correction system A method and apparatus for correcting single bit errors in data stored in a first memory includes a dynamic shift register for dividing data by a polynomial during the time the data is being written into the first memory resulting in the generation of a r... | 03/19/1985 |
| 4506261 | Integrated gas discharge display panel A display device comprising a transparent substrate bonded to a portion of a printed circuit board forming the display envelope, the circuit board including a plurality of electrical conductors. A first portion of the electrical conductors has one end for... | 03/19/1985 |
| 4497892 | Method for forming multiple images on a photographic film A method and apparatus for generating a negative or positive image from a single photographic medium. A source of radiant energy is projected onto a sheet of dielectric material heating the material to a polarizing temperature. A pair of electrical conduc... | 02/05/1985 |
| 4490853 | Matrix character reading system A method and apparatus for selecting the start of an unknown character sensed by a character recognition system. A multi-channel read head develops a plurality of analog waveforms which form the image of an unknown character sensed by the read head. After... | 12/25/1984 |
| 4490852 | Image capturing apparatus A hand held character scanning system is provided in which logic circuits are responsive to the generation of digitized data signals representing the character scanned together with the background area adjacent the character to determine if the data signa... | 12/25/1984 |
| 4490057 | Print wire solenoid A matrix print wire solenoid used in a wire matrix printer and including an enclosure member releasably secured to one end of the solenoid by a spring member deformed by the outer surface of the enclosure member to pre-load the enclosure member and an ene... | 12/25/1984 |
| 4490850 | Matrix character recognition A character recognition system is disclosed in which each row of a plurality of parallel rows of binary signals representing the configuration of an unknown character is sequentially compared to a plurality of templates, each representing a known characte... | 12/25/1984 |
| 4488058 | Snubber circuit for use in an uninterruptible power supply A circuit for eliminating current transients in a switching circuit of an uninterruptible power supply having a main source of AC signals and an inverter for supplying AC signals from a DC source including gating device operated in response to receiving s... | 12/11/1984 |
| 4485388 | Compact print head A circuit board is utilized to hold a plurality of ink droplet producing elements in compact manner and conductive portions of the board are connected to actuate the elements in pulse-on-demand type printing.... | 11/27/1984 |
| 4484202 | Coiled conduits within ink jet reservoir A movable ink reservoir carries a plurality of ink jet printing elements and supplies ink to the elements by means of individual conduits. The individual conduits are coils of tubing arranged in stacked side-by-side manner and the reservoir includes a por... | 11/20/1984 |
| 4484170 | Dot matrix print head solenoid assembly A plurality of solenoid bobbins or bobbin wound coils are collectively attached to and supported from one surface of a printed circuit board and the coil wires are securely connected to the conductors on the board.... | 11/20/1984 |
| 4484084 | Power MOSFET transfer switch A switching circuit in a power supply for switching between a main power source and a standby power source includes gating device operated at the time failure of the main power source occurs to disable the operation of a plurality of MOSFETs which are swi... | 11/20/1984 |
| 4484068 | Bar code processing apparatus There is disclosed a bar code processing system in which a plurality of vertically aligned sensing devices are positioned adjacent a moving document on which is located a plurality of dot matrix printed coded bars. Each of the sensing devices is positione... | 11/20/1984 |
| 4470111 | Priority interrupt controller An interrupt control unit which couples a plurality of peripheral devices to a central processor includes a counter for outputting signals for monitoring a plurality of encoders each coupled to a number of peripheral devices, each encoder outputting the a... | 09/04/1984 |
| 4466058 | Method and apparatus for establishing priority between processing units having a common communication channel A system for controlling the flow of data over a common bus between a plurality of processing units is disclosed which preferably includes a MOS/LSI circuit controller chip associated with each processing unit for awarding priority of access to the common... | 08/14/1984 |
| 4463362 | Ink control baffle plates for ink jet printer A movable ink reservoir carries a plurality of ink jet print heads and supplies ink to the heads by means of separate conduits. The reservoir includes baffle means therein formed to provide individual ink tanks for the print heads and to prevent or substa... | 07/31/1984 |
| 4462037 | Ink level control for ink jet printer The level of ink in a reciprocating reservoir is automatically controlled for both printing and non-printing conditions. The reciprocating motion creates forces to cause the ink to move back and forth between the reciprocating reservoir and a main reservo... | 07/24/1984 |
| 4460905 | Control valve for ink jet nozzles The valve mechanism controls the flow of ink from a pressurized ink supply to a plurality of ink nozzles for printing bar codes. The mechanism includes a valve ball and a valve seat and an elastic diaphragm is positioned opposite the valve seat and is mov... | 07/17/1984 |
| 4457015 | Matrix character preprocessing system A system for processing data used by a recognition system in recognizing an unknown character. A multi-channel read member generates a plurality of parallel rows of data bits which taken together form an image of the character to be recognized. In order t... | 06/26/1984 |
| 4454518 | Temperature control of ink for ink jet printer The ink fluid in a reservoir is heated to establish a temperature differential between the ink fluid therein and the ink flowing through a print head and being ejected therefrom in the form of ink droplets. The temperature differential in the ink tends to... | 06/12/1984 |
| 4450350 | Low speed laser scanning apparatus Apparatus for generating a scanning pattern for the omni-directional reading of bar code indicia. In one embodiment, a rotating mirror assembly is imaged onto itself by a lens and mirror combination which introduces a light displacement of the image resul... | 05/22/1984 |
| 4449202 | Full duplex integrated circuit communication controller An integrated circuit chip for controlling the transmission of data between a host peripheral device and other peripheral devices or a remote processor in which the transmission of data takes place in either a processor interrupt mode or a direct memory a... | 05/15/1984 |
| 4441830 | Printing solenoid A dot matrix print actuator of low cost and compact rectangular design is constructed of flat, mild steel stock. An armature is engageable with a spring loaded print wire which is guided through a passageway in the poles of the actuator which are on eithe... | 04/10/1984 |
| 4439051 | Single printing station, multiple record member feeding mechanism A single drive mechanism providing selective feeding of at least two printing media and independent bi-directional movement of the media in the operation of a single print station. The drive mechanism including a platen member is movable to allow the two ... | 03/27/1984 |
| 4433902 | Projection printer A non-impact printing method wherein pulsed light is transmitted through a mask containing enlarged characters. The characters are optically reduced and are focused on a document in back of a heat-sensitive or thermal magnetic ink ribbon. Heat energy proj... | 02/28/1984 |
| 4433341 | Ink level control for ink jet printer The level of ink in a reciprocating reservoir is automatically controlled for both printing and non-printing conditions. The reciprocating motion creates forces to cause the ink to move back and forth between the reciprocating reservoir and a main station... | 02/21/1984 |
| 4423320 | Encoded card reader A reader for punched hole cards having a movable housing member containing a coil spring is disclosed, the housing member is actuated by a card inserted in the reader and moved to an activated position against the action of the spring. Secured to the hous... | 12/27/1983 |
| 4422782 | Record member feed and support mechanism A feed mechanism for moving a record member into a printing position in which a single control solenoid is energized to enable a pair of drive rollers to move a multi-form record member from a holding position to a printing position. Operation of the sole... | 12/27/1983 |
| 4419736 | Teleprinter terminal A teleprinter terminal includes a keyboard and a printer, each of which is operated by means of a self-contained microprocessor, and a third microprocessor is programmed to handle the communications. The three microprocessors are interconnected to operate... | 12/06/1983 |
| 4418356 | Ink jet print head A cluster or array of ink jet printing elements consisting of two or more inclined rows of tubular transducers are folded or indexed in an interleaf pattern to maintain the nozzles of the transducers in parallel manner for use in a compact print head.... | 11/29/1983 |
