Patent US3629209A successfully refreshed from Google Patents.
US3629209A
Expired / Lapsed
US
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Interpolymers of ethylene and acrylamides
Assignee: Monsanto Co
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Filing: 1968-08-28
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Granted: 1971-12-21
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Expires: 1988-08-28
Abstract
Abstract HARD, TOUGH, TRANSPARENT INTERPOLYMERS OF ETHYLENE CONSISTING ESSENTIALLY OF 99.5 TO 75 MOL PERCENT OF ETHYLENE AND FROM ABOUT 0.5 TO ABOUT 25.0 MOL PERCENT OF A COMPOUND SELECTED FROM THE GROUP CONSISITING OF N-ISPROPYLACRYLAMIDE, N-TERT-BUTYLACYLAMIDE AND MIXTURES THEREOF.
Inventors
- 👤 David W Mcdonald
- 👤 George A Mortimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:28
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F10/00
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |