Variable capacitance measuring device

Details Variable capacitance measuring device Variable capacitance measuring device

2006-05-16

2006-05-16

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

C073S715000, C073S700000

Reexamination Certificate

active

07043994

ABSTRACT:
A variable capacitance measuring device can comprise any one or more features in various different embodiments allow a reliable, compact device to be achieved. A capacitor electrode, a gettering housing, and pinch-off connector may be aligned along a common axis may reduce width dimensions without a substantial increase in length. Temperature-induced variations may be reduced by selecting materials that have coefficients of thermal expansion relatively closer to one another. Substantially varying topologies for ceramic-metal interfaces may reduce the likelihood of external contaminants from reaching the evacuated portion of the device. A tube can be used between the capacitor portion and a gettering housing to isolate external forces and getter activation heat from the sensor. The same tube also reduces heat loss from a heated sensor and protects the electronics from overheating. Embodiments also include processes for using and forming the devices.

REFERENCES:
patent: 4135936 (1979-01-01), Ballard, Jr.
patent: 4414282 (1983-11-01), McCollister
patent: 4536203 (1985-08-01), Kramer
patent: 4823603 (1989-04-01), Ferran
patent: 5019783 (1991-05-01), Cadwell
patent: 5178015 (1993-01-01), Loeppert et al.
patent: 5820989 (1998-10-01), Reed
patent: 5939639 (1999-08-01), Lethbridge
patent: 6105436 (2000-08-01), Lischer
patent: 6205861 (2001-03-01), Lee
patent: 6568274 (2003-05-01), Lucas
How to Select and Use Capacitance Diaphragm Gauges, Millipore , A Vacuum Application Guide, Millipore Corporation, 16 pages, 2000.
Glass-Mica Composites, Mykroy/Mycalex Ceramics, Spaulding Composites Co. http://www.mykrov-mycalex.com/prop5.htm—4 pages.
Anthony Rollett,Heat Treatemnt of Glass Ceramics, Carnetie Mellon University, 4 pgs.
“Glass-Ceramics: Everything you need to know”, 3 pgs.
Stroud, J.S,Property Sheet, Schott Glass Technologies Inc., Duryea, PA, 8 pgs., 1997.
Henderson, et al.,Determination of the Optimum Crystallization Conditions of a High Thermal Expansion Glass-Ceramic, Monsanto Research Corporation for the U.S. Dept. of Energy, 9 pgs., 1984.
Introduction to Mica, Inderchand Rajarhia & Sons (P) Ltd., http://www.icrmica.com/icrmica—mica—introduction.htm , 2 pgs.
Schott Glas,Types of Technical Glasses, pp. 2-39, Mainz, 2000.
Schott Glas,Electronic Packaging Glass-to-Metal Seals, 24 pgs.

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