US3499872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polymers containing polyurea or polyhydrazodicarbonamide linkages
Assignee: Bayer AG
•
Filing: 1966-08-19
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Granted: 1970-03-10
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Expires: 1986-08-19
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm Thoma
- 👤 Heinrich Rinke
- 👤 Harald Oertel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3259; C08G18/3265; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE838217C
Cited
US3087912A
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US3148173A
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US3202636A
Cited
US3077006A
Cited
US3305533A
Cited
US3236812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |