Patent US3265669A successfully refreshed from Google Patents.
US3265669A
Expired / Lapsed
US
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Liquid amine hardener compositions for polyurethane resins
Assignee: Furane Plastics Inc
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Filing: 1963-08-19
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Granted: 1966-08-09
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Expires: 1983-08-19
Abstract
No abstract record available.
Inventors
- 👤 Frank N Hirosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:36
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A LIQUID ROOM TEMPERATURE CURING AGENT FOR PRODUCTION OF A THERMOSETTING RUBBER-LIKE COMPOSITION FROM POLYURETHANE PREPOLYMERS COMPRISING AN AROMATIC DIAMINE HAVING TWO ACTIVE NITROGEN-HYDROGEN BONDS, DISSOLVED IN A N-SUBSTITUTED 2-PYRROLIDONE HAVING THE STRUCTURE 1-R-PYRROLIDIN-2-ONE WHERE R IS A MEMBER OF THE GROUP CONSISTING OF A LOWER ALKYL AND A VINYL GROUP.
Claim 2
Dependent Claim
51 words
A LIQUID ROOM TEMPERATURE CURING AGENT FOR PRODUCTION OF A THERMOSETTING RUBBER-LIKE COMPOSITION FROM POLYURETHANE PREPOLYMERS COMPRISING AN AROMATIC DIAMINE HAVING TWO ACTIVE NITROGEN-HYDROGEN BONDS, DISSOLVED IN A N-SUBSTITUTED 2-PYRROLIDONE HAVING THE STRUCTURE 1-R-PYRROLIDIN-2-ONE WHERE R IS A MEMBER OF THE GROUP CONSISTING OF A LOWER ALKYL AND A VINYL GROUP.
References Cited (Backward Citations)
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US3038876A
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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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |