Fred W Kavli, Age 971801 Solar Dr UNIT 250, Oxnard, CA 93030

4388668, Jun 14, 1983

Dec 3, 1979

6/099600

Robert L. Bell - Chatsworth CA
Robert Willing - Anaheim CA
Fred Kavli - Woodland Hills CA

Kaylico Corporation - Chatsworth CA

H01G 700

361283

A capacitive pressure transducer comprising a pair of disc shaped members having planar surfaces made from an insulator material, one of the members being several times thinner than the other plate and flexible and constituting a diaphragm and the other thicker plate constituting a stationary plate. A thin conductive film is formed on the surface of each of the members to form the plates of the capacitor. A glass frit is applied on the marginal edge of each member and when the members are held in adjacent relationship, the assembly is fired to seal the two members together while spacing them a predetermined distance apart so that the two conductive plates are opposite each other and are separated by an open gap of a predetermined distance, the two conductive plates being insulated one from the other. Leads are electrically connected to the conductive plate of each disc through the fused glass frit. When pressure is applied to the member, the diaphragm member is displaced thereby changing the capacitance of the pressure transducer.

5349865, Sep 27, 1994

Aug 30, 1993

8/114000

Fred Kavli - Santa Barbara CA
Kyong M. Park - Thousand Oaks CA

Kavlico Corporation - Los Angeles CA

G01L 912

73724

A radically simple, reliable, inherently accurate, intrinsically wide-pressure-range adaptable, low to ultra-high pressure capable capacitive transducer is made from a reference capacitor and a variable capacitor, one electrode of each of which is formed of a flat conductive layer on a circular insulating plate. The reference capacitor electrode is a peripheral annulus surrounding the central disk constituting the variable capacitor electrode. The insulating plate is rigidly held slightly spaced apart from a flat, flexible metal diaphragm which provides the opposing electrode for each capacitor. The diaphragm is an integral part of a pressure fitting which includes a fluid pressure input coupling and a pressure chamber adjacent to the diaphragm. Changes in the fluid pressure cause deflections of the diaphragm which alter the capacitance of the variable capacitor formed by the metal diaphragm as one electrode and the conductively coated disk as the other electrode, which is the variable-capacitor electrode on the central disk of the rigid insulating plate. The changes in capacitance can be detected by standard electronic circuits and calibrated to provide a measure of the changes in the fluid pressure.

4329732, May 11, 1982

Mar 17, 1980

6/130695

Fred Kavli - Woodland Hills CA
Kyong Park - Chatsworth CA
John J. Affel - Chatsworth CA

Kavlico Corporation - Chatsworth CA

H01G 700

361283

Two square plates of ordinary inexpensive soda lime glass are spaced apart from one another, and are sealed together by a ring of glass frit, with the two plates overlying one another, but with the corners of the two plates displaced so that the corners of each of the two plates extend past the sides of the other plates. The plates may be spaced apart by a small distance, for example, from about 1/2 to several thousandths of an inch, and thin conductive layers on the two facing surfaces form a variable capacitor which changes in capacitance when pressure is applied to the outside of the two plates. Connections for the conductive plates extend out to the corners of the plates beyond the sides of the other plate to permit easy access. Electrical connections are made through the use of elongated conductive rubber elements. Silicone rubber gaskets and suitable plastic housing members including electrical shielding are employed to mount the capacitive transducer and its associated output hybrid electronic circuit which assembly may be mounted on a ceramic substrate.

4177496, Dec 4, 1979

Sep 19, 1977

5/834498

Robert L. Bell - Chatsworth CA
Robert Willing - Anaheim CA
Fred Kavli - Woodland Hills CA

Kavlico Corporation - Chatsworth CA

H01G 700

361283

A capacitive pressure transducer comprising a pair of thin discs made from an insulator, a thin metal film metalized onto each of the discs and forming the plates of the capacitor, and means for bonding the two discs together such that the two metal films are opposite each other, the two metal films are separated by an open gap, and the two metal films are insulated one from the other. When pressure is applied to the discs, the discs are displaced thereby changing the capacitance of the pressure transducer.

4680971, Jul 21, 1987

Nov 19, 1985

6/799447

Fred Kavli - Malibu CA
Kyong Park - Chatsworth CA

Kavlico Corporation - Moorpark CA

G01L 708
G01L 912
G01L 1302
H01G 700

73718

A corrosion proof differential pressure transducer includes a central disk and two thin ceramic diaphragms mounted close to but spaced from the disk on both sides thereof, with the diaphragms being intercoupled to move together. This may be accomplished, for example, by a rod passing through a hole in the center of the central disk which is secured to each of the diaphragms; or by a fluid such as silicone oil between the diaphragms and flowing through one or more holes through the central disk. The diaphragm, and disks and the rod are formed of alumina, quartz, or other inert, insulating material having substantially zero mechanical hysteresis. Conductive plates providing variable capacitance with changes in pressure are mounted on the inner surface one or both of the diaphragms and on the facing surface of the central disk. A housing and associated gaskets direct pressures from two different fluids to the two diaphragms, so that the differential pressure is measured.

4735098, Apr 5, 1988

Mar 11, 1986

6/838514

Fred Kavli - Malibu CA
Kyong Park - Chatsworth CA

Kavlico Corporation - Moorpark CA

G01L 708
G01L 912
G01L 904

73718

A corrosion proof differential pressure transducer includes a central disk and two thin diaphragms mounted close to but spaced from the disk on both sides thereof, with the diaphragms being intercoupled to move together. This may be accomplished, for example, by a rod passing through a hole in the center of the central disk which is secured to each of the diaphragms; or by a fluid such as silicone oil in the space between the diaphragms and flowing through one or more holes through the central disk. At least one of the diaphragms, the central disk and the rod (when one is used) are formed of alumina, quartz, or other inert, insulating material having substantially zero mechanical hysteresis. One of the diaphragms may be a thin, tough, flexible insulating membrane. Conductive plates providing variable capacitance with changes in pressure may be mounted on the inner surface one or both of the diaphragms and on the facing surface of the central disk.

4426673, Jan 17, 1984

Mar 13, 1980

6/131417

Robert L. Bell - Chatsworth CA
Robert Willing - Anaheim CA
Fred Kavli - Woodland Hills CA

Kavlico Corporation - Chatsworth CA

H01G 700

361283

A capacitive pressure transducer comprising a pair of disc shaped members having planar surfaces made from an insulator material, one of the members being several times thinner than the other plate and flexible and constituting a diaphragm and the other thicker plate constituting a stationary plate. A thin conductive film is formed on the surface of each of the members to form the plates of the capacitor. A glass frit is applied on the marginal edge of each member and when the members are held in adjacent relationship, the assembly is fired to seal the two members together while spacing them a predetermined distance apart so that the two conductive plates are opposite each other and are separated by an open gap of a predetermined distance, the two conductive plates being insulated one from the other. Leads are electrically connected to the conductive plate of each disc through the fused glass frit. When pressure is applied to the member, the diaphragm member is displaced thereby changing the capacitance of the pressure transducer.