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Patent US3583946A successfully refreshed from Google Patents.
US3583946A
Expired / Lapsed
US
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Polyureas derived from dipiperidines
Assignee: Monsanto Co
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Filing: 1969-04-24
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Granted: 1971-06-08
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Expires: 1989-04-24
Abstract
Abstract POLYMERS SUITABLE FOR FORMING FILAMENTS, FILMS, AND PLASTIC PRODUCTS ARE DERIVED FROM POLYMETHYLENE DIPIPERIDINE AND ORGANIC DIISOCYANATES.
Inventors
- 👤 Frank Dobinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3246; Y; Y10; Y10S; Y10S528/00; Y10S528/906
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |