U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Icon_funbox Bizarre Patents

Patent No. 6681419

Forehead support apparatusĀ 

A forehead support apparatus for resting a standing users forehead against a wall above a bathroom commode or urinal or beneath a showerhead.

Newsletter  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.

 

Patents Published on 04/23/1991


See All Patents Issued In 1991


                    41  
NumberTitleIssue Date
5010574Vector quantizer search arrangement
In an arrangement for coding multi-element signals such as used in speech or image processing, a plurality of N element reference signals representable in a prescribed vector space are stored. An N element input signal representable in the prescribed vect...
04/23/1991
5010575Audio current pick-up device
An audio current pick-up device for use with an electric wire 6 carrying an electric current containing audio information comprises a pair of substantially identical magnetic induction coil assemblies 26, 27 disposed in parallel to each other with an axia...
04/23/1991
5010576Active acoustic attenuation system for reducing tonal noise in rotating equipment
An active acoustic attenuation system for attenuating tonal blade pass noise in a multi-bladed fan uses a sinusoidal rotational speed signal produced by an accelerometer mounted on the fan as the reference signal for a filtered-X LMS (least mean squarae) ...
04/23/1991
5010577Electronic volume device
An electronic volume device of a chopper type in which a switching control unit thereof can be composed of a monolithic integrated circuit and which controls a quantity of attenuation of an analog signal input to the device by switching the analog signal ...
04/23/1991
5010578Method and apparatus for the identification of metal surface finishes
The apparatus includes a specialized scanning system for sampling the metal includes an annular light source for omindirectionally illuminating the surface, a light regulator, and a matrix camera for forming a grey level image of the surface. The image is...
04/23/1991
5010579Hand-written, on-line character recognition apparatus and method
A hand-written, on-line character recognition apparatus, and the method employed by it, in which the structure of a dictionary for recognition is formed as a sub-routine type, whereby the dictionary can be made small in size and a time necessary for recog...
04/23/1991
5010580Method and apparatus for extracting information from forms
A system for extracting handwritten or typed information from forms that have been printed in colors other than the color of the handwritten or typed information. The information extraction system includes a detector for detecting color values for scanned...
04/23/1991
5010581Data processing apparatus having function for retrieving abstract and original image data
A data processing apparatus for electronically filing image date including reduced image data is disclosed. An operator sets up a retrieval mode in the filing apparatus, and enters a retrieval code for retrieving desired image data. These operations are m...
04/23/1991
5010582Pickup driving device for disk player
A pickup driving device for a disk player is provided, wherein the gain of a negative feedback circuit for driving a slider motor is made variable and the gain is changed correspondingly to the operation mode of a disk player, which made it possible to in...
04/23/1991
5010583Repeater for a wide area coverage system
A repeater for a wide area coverage multiple repeater system (100) includes a receiver (220) and a transceiver (230). The receiver (220) receives a received signal from a portable or mobile communication unit (130) on an inbound channel. The received sign...
04/23/1991
5010584Mobile communication transceiver
A mobile communication transceiver includes a controller. The controller includes an A/D converter, a memory, and a CPU. The A/D converter converts an output voltage corresponding to a reception input voltage from the receiver into a digital signal. The m...
04/23/1991
5010585Digital data and analog radio frequency transmitter
A digital Non Return to Zero (NRZ) and Frequency Modulated (FM) radio transmitter intended but not unique to, for the transmission of Digital, Tone Only or Tone and Voice paging messages is described. This transmitter is built on the concept that the sepa...
04/23/1991
5010586Optical two-way transmission system with loop reflector modulator
A two way transmission system has a source at one terminal and a fibre loop at the other terminal. Conventional modulation techniques are used at the terminal with the source, whereas at the other terminal modulation is achieved by modulation of the biref...
04/23/1991
5010587Appartaus for transmitting a coherent frequency modulated optical signal
A first (1) and a second (6) narrowband laser device (1, 6) are each connected to an optical coupler means (3, 8) and also to each an input (13, 14) of a directional coupler (15). The coupler means (3, 8) have their respective outputs (5, 10) connected to...
04/23/1991
5010588Ultrawide-bandwidth low-noise optical receiver
An ultrawide-bandwidth, low-noise optical receiver is disclosed. The receiver comprises a photodiode (402) connected to a high-impedance three-stage (421, 422, 423) HEMT preamplifier through an inductive/resistive modified T-network (404) the latter circu...
04/23/1991
                    41  
 
Sign InRegister
Username  
Password   
forgot password?