US3186972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric maleic anhydride and method of making
Assignee: Dow Chemical Co
•
Filing: 1961-01-16
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Granted: 1965-06-01
•
Expires: 1981-01-16
Abstract
No abstract record available.
Inventors
- 👤 John L Lang
- 👤 William A Pavelich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:39
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |