US3535274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight polyurethanes prepared from (a) a polyisocyanate,(b) a monofunctional tertiary amino compound,and (c) a monofunctional compound containing halogen atoms or sulfuric acid ester groups
Assignee: Bayer AG
•
Filing: 1965-01-07
•
Granted: 1970-10-20
•
Expires: 1985-01-07
Abstract
No abstract record available.
Inventors
- 👤 Dieter Dieterich
- 👤 Erwin Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/32; C08G18/3271; C08G2101/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE880485C
Cited
US2889366A
Cited
US2955108A
Cited
US3036998A
Cited
US3294752A
Cited
US3395129A
Cited
FR1379133A
Cited
US3388087A
Cited
FR1383252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |