US3694401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel polyurethane films
Assignee: Individual
•
Filing: 1970-10-22
•
Granted: 1972-09-26
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Expires: 1990-10-22
Abstract
Abstract NOVEL POLYURETHANE POLYMERS FORMED BY REACTING A POLYSIOCYANATE WITH A POLYEPOXIDE COPOLYMER OF 3,3-BIS(CHLOROMETHYL)-OXETANE AND 3-ALKYL-3-HYDROXYMETHYLOXETANE AND OPTIONALLY-3-CHLOROMETHYL-3-HYDROXYMETHYLOXETANE WHICH ARE RESISTANT TO HYDROLYSIS.
Inventors
- 👤 Jurgen Gartner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5003; C08G18/5006; C08G18/5009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |