Patent US2880564A successfully refreshed from Google Patents.
US2828271A
Expired / Lapsed
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Method of foaming a phenol-formaldehyde resin using diazonium salts as blowing agents
Assignee: Fairey Aviation Co Ltd
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Filing: 1954-06-11
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Granted: 1958-03-25
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Expires: 1974-06-11
Abstract
No abstract record available.
Inventors
- 👤 Armstrong Alma Patricia
- 👤 Cameron James Brisbane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:10
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08J2361/00; C08J2361/04; C08J2361/06; Y; Y10; Y10S; Y10S264/00; Y10S264/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
THE METHOD OF FORMING AN EXPANDED RESIN WHICH COMPRISES MIXING (1) A PARTIALLY PRECONDENSED PHENOLFORMALDEHYDE RESIN MIXTURE HAVING AT LEAST TWO MOLECULES OF FORMALDEHYDE PER MOLECULE OF PHENOL WITH (2) A DIAZONIUM SALT HAVING THE FORMULA
Claim 2
Independent Claim
36 words
THE METHOD OF FORMING AN EXPANDED RESIN WHICH COMPRISES MIXING (1) A PARTIALLY PRECONDENSED PHENOLFORMALDEHYDE RESIN MIXTURE HAVING AT LEAST TWO MOLECULES OF FORMALDEHYDE PER MOLECULE OF PHENOL WITH (2) A DIAZONIUM SALT HAVING THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |