John David Summers

US Patent:

52471330, Sep 21, 1993

Filed:

Aug 29, 1991

Appl. No.:

7/751854

Inventors:

David A. Wiemann - Mesa AZ
James E. Jaskie - Scottsdale AZ
John Summers - Apache Junction AZ
Robert C. Kane - Woodstock IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01L 2302

US Classification:

174 17R

Abstract:

An enclosure providing an evacuated region about an array of microelectronic vacuum devices including a substrate, a first encapsulation member defining a cavity, a second encapsulation member defining a cavity and mating with the first encapsulation member so as to define an encapsulated region, a ledge formed in the first encapsulation member for supporting the substrate and defining a communicating passage between the cavities and a sealing agent disposed between the mating surfaces of the encapsulation members to effect a vacuum seal such that when the encapsulated region is evacuated it will be at the same vacuum levels throughout to eliminate differential pressure induced deformation of the substrate. The evacuated substrate enclosure further provides for assembly without an evacuated environment.

US Patent:

40575195, Nov 8, 1977

Filed:

Dec 15, 1975

Appl. No.:

5/641077

Inventors:

John E. Summers - McMurray PA
John F. Hadley - Bradford Woods PA

Assignee:

H. H. Robertson Company - Pittsburgh PA

International Classification:

C08G 1838
C08G 1814

US Classification:

260 25AK

Abstract:

Polyurethane foam products having relatively noncombustible properties, low flame spread ratings and low smoke generating tendencies when exposed to fire can be produced by combining aqueous sodium silicate into the foam forming composition which also includes a viscous, hydroxyl-terminated polyester and a polyisocyanate prepolymer or quasi-prepolymer along with a suitable catalyst, surfactant and halogenated alkane blowing agent. The aqueous sodium silicate ingredient constitutes from about 30 to 60 percent by weight. The aqueous sodium silicate has a weight ratio of SiO. sub. 2 /Na. sub. 2 O of 2. 4 to 3. 0 and contains 25 to 75 percent by weight water. The resulting foam, with a density of 1. 5 to 4. 5 pounds per cubic foot, has a K-factor less than 0. 26 and is useful as a thermal insulating substance, especially in building panels.