Patent US4156761A successfully refreshed from Google Patents.
US4156761A
Expired / Lapsed
US
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Room temperature cured elastomer
Assignee: United States Department of the Navy
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Filing: 1978-08-24
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Granted: 1979-05-29
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Expires: 1998-08-24
Abstract
Abstract Hydroxy terminated polybutadiene is reacted with naphtyl-potassium and 1-mo-2,4-pentadiene in successive steps to form a bis(1,3-pentadienyl ether) derivative. Then the bismaleimide of dimer diamine is added to the polybutadiene derivative whereby a room temperature cure to an elastomer is achieved.
Inventors
- 👤 Eugene C. Martin
- 👤 Arnold Adicoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:34
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/34; C08C19/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A method for producing an elastomer which comprises the steps of: A. preparing the bis(1,3-pentadienyl ether) derivative of hydroxy terminated polybutadiene and B. curing said derivative with a bismaleimide of dimer diamine.
Claim 2
Independent Claim
32 words
A method for producing an elastomer which comprises the steps of: A. preparing the bis(1,3-pentadienyl ether) derivative of hydroxy terminated polybutadiene and B. curing said derivative with a bismaleimide of dimer diamine.
References Cited (Backward Citations)
US3758426A
Cited
US4124657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |