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

Icon_funbox Bizarre Patents

Patent No. 5719655

System for magnetically attaching templeless eyewear to a person

A system of eyewear that eliminates the need for hinges on the frames of the eyewear.

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.

 

Class 73/521 - Fluid


Subclass of Class 73 - Measuring and testing
Definition: Apparatus in which a fluid is used.
No. of patents: 20
Last issue date: 07/21/2009


NumberTitleIssue Date
7562574Method and device for measuring acceleration and/or inclination by using thermal convection of a fluid
Provided is an apparatus for measuring acceleration and a tilt angle using thermal convection of a fluid which includes a container containing the fluid, a heating body including a first heating element and a second heating element arranged in the container and a cr...
07/21/2009
7080553Micro-accelerometer
A micro-accelerometer includes first and second closed cavities, into each of which an equal quantity of gas is introduced. A membrane partitions the symmetrical first and second cavities. Temperature sensors are provided within the first and second cavities, respec...
07/25/2006
6845653Coating stretch tester
A test apparatus and method for predicting the minimum runnable flow of a curtain coating fluid by forcing the coating fluid out of a small round tube opening with less flow rate than is required for momentum to exceed the contracting forces of surface tension. The ...
01/25/2005
6244113Method and apparatus for measuring microgravity acceleration
The invention provides an apparatus for measuring microgravity acceleration that includes an elongate flow chamber having a first end and a second end and a liquid contained therein. Each end of the chamber is engaged by a plug member that is positioned t...
06/12/2001
5184506Transmission input shaft speed detecting apparatus utilizing oil pump pressure
An apparatus for use with a transmission including an input shaft, and an oil pump rotatable in synchronism with the input shaft to detect a speed of rotation of the input shaft. The apparatus comprises a pressure sensor sensitive to an oil pressure disch...
02/09/1993
4969360System for measuring the cyclic speed and rotational position of a traveling looped belt
A system for determining the rotational, or cyclic, speed and rotational position of a looped traveling belt, such as a felt in a papermaking machine, utilizes a discontinuity, or caliper variation, in the surface of the belt near one edge thereof. A flui...
11/13/1990
4602509Fluidic angular velocity sensor
A fluidic sensor providing a differential pressure signal proportional to the angular velocity of a rotary input. In one embodiment the sensor includes a fluid pump having an impeller coupled to a rotary input. A housing forming a constricting fluid flow ...
07/29/1986
4602510Fluidic rotational speed sensor
A device for measuring the rotational speed of a rotating object in which a tream of fluid from a back pressure sensor is directed at a chopper wheel attached to the rotating object. The output of the back pressure sensor varies as the chopper wheel rotate...
07/29/1986
4594894Angular velocity sensor
The accuracy of a fluid jet angular velocity sensor is increased by reducing flow disturbances which tend to increase the device's temperature sensitivity....
06/17/1986
4584909Hydraulic control system for continuously variable V-belt transmission
A continuously variable V-belt transmission has a change-direction gearing upstream of a drive pulley, and a hydraulic control system. The hydraulic control system comprises a shift control valve for controlling the distribution of fluid pressure between ...
04/29/1986
4406166Analog fluidic speed sensor
An analog fluidic speed sensor including novel structure enhancing the signal-to-noise ratio of the sensor....
09/27/1983
4382484Fuel-efficient energy storage automotive drive system
A fuel-saving energy storage vehicle drive system which saves fuel, primarily under stop-and-go driving conditions, by collecting, storing and using energy normally lost in the braking or deceleration of the vehicle, by automatically controlled operation ...
05/10/1983
4328706Tachometer suitable for use in engine maintenance
Pressure changes in the engine case of an automobile are sensed to compute and display the engine rpm irrespective of the types of engines. A pressure sensing element is mounted on the oil filler port in the engine cylinder head cover by means of a mounti...
05/11/1982
4222271Digital fluidic output force balance accelerometer
A digital fluidic output accelerometer which has a proportional fluid ampier for balancing forces acting on a mass which is rotatably mounted on air bearing means and has a digital fluidic output which produces digital signals that are proportional to ac...
09/16/1980
4144725Centrifugal regulator
A centrifugal regulator comprises a casing containing mercury able to be set in motion by a drive shaft and a coupling means pivotally mounted on a hub. Two chambers of lower density than the mercury are pivoted to two spindles which in turn are pivoted t...
03/20/1979
4119819Fluid activated velocity switch
A member mounted for limited rotation having a conduit coaxially connected to the member for directing a stream of air to the member, which stream is deflected radially outwardly and tangentially away from the member to cause rotation in a first direction...
10/10/1978
4002077Integrating angular accelerometer
An integrating angular accelerometer for measuring angular rate of a rotating body has a stationary cylindrical inertial mass supported by a low drag hydrostatic bearing concentrically in a housing rotatable relative thereto and filled with a viscous flui...
01/11/1977
3994176Pneumatic apparatus for measuring rate of movement
A pneumatic apparatus for measuring the rate of movement of one object with respect to another. A pneumatic signal functionally related to the displacement of the object whose rate is being measured is generated, differentiated and recorded. The apparatus...
11/30/1976
3942557Vehicle speed detecting sensor for anti-lock brake control system
The sensor comprises an operational circuit consisting of fluidic elements. The detecting sensor causes variation in the pressure of a control fluid supplied to the operational circuit. The variation of pressure, depending on the rotational speed of vehic...
03/09/1976
3936237Membrane-air pump adapted to function as a tachometer
A membrane-air pump functioning as a tachometer, having a first flow circuit whose pneumatic flow or pressure values serve as speed-dependent guide parameters for control or regulating apparatus. A second flow circuit leads from the pressure or delivery s...
02/03/1976
 
Sign InRegister
Username  
Password   
forgot password?