Patent US5776990A successfully refreshed from Google Patents.
US5776990A
Expired / Lapsed
US
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Foamed polymer for use as dielectric material
Assignee: GlobalFoundries Inc
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Filing: 1993-03-11
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Granted: 1998-07-07
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Expires: 2013-03-11
Abstract
Abstract The present invention relates to an insulating foamed polymer having a pore size less than about 1000 Å made from a copolymer comprising a matrix polymer and a thermally decomposable polymer by heating the copolymer above the decomposition temperature of the decomposable polymer.
Inventors
- 👤 James Lupton Hedrick
- 👤 Donald Clifford Hofer
- 👤 Jeffrey William Labadie
- 👤 Robert Bruce Prime
- 👤 Thomas Paul Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:07
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C08J2201/00; C08J2201/04; C08J2201/046
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A process for forming a foamed polymer having a pore size less than about 1000 Å comprising the steps of: a. forming copolymer of a matrix polymer and a thermally decomposable polymer which thermally decomposes at a temperature below the decomposition temperature of the matrix polymer; b. heating said copolymer to a temperature at or above the decomposition temperature of the thermally decomposable polymer and below the glass transition temperature and the decomposition temperature of the matrix polymer to form said foam polymer.
Claim 2
Dependent Claim
83 words
A process for forming a foamed polymer having a pore size less than about 1000 Å comprising the steps of: a. forming copolymer of a matrix polymer and a thermally decomposable polymer which thermally decomposes at a temperature below the decomposition temperature of the matrix polymer; b. heating said copolymer to a temperature at or above the decomposition temperature of the thermally decomposable polymer and below the glass transition temperature and the decomposition temperature of the matrix polymer to form said foam polymer.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the pore size is less than about 400 Å.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the decomposition temperature of the thermally decomposable polymer is greater than 150° C.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said thermally decomposable polymer is poly (propylene oxide) or poly(methyl methacrylate).
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said matrix polymer is polyimide or poly (phenylquinoxaline).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |