Patent US3028081A successfully refreshed from Google Patents.
US3073802A
Expired / Lapsed
US
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Polyether urethanes prepared in the presence of stannic chloride
Assignee: Bayer AG
•
Filing: 1959-10-22
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Granted: 1963-01-15
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Expires: 1979-10-22
Abstract
No abstract record available.
Inventors
- 👤 Windemuth Erwin
- 👤 Schnell Hermann
- 👤 Bayer Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:00
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C08G18/248; Y; Y10; Y10S; Y10S528/00; Y10S528/904; Y10S528/906
Claims Analysis
Total Claims: 0
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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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |