Patent US3380980A successfully refreshed from Google Patents.
US3380980A
Expired / Lapsed
US
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Preparation of methyl methacrylate polymer sirups
Assignee: EIDP Inc
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Filing: 1965-01-06
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Granted: 1968-04-30
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Expires: 1985-01-06
Abstract
No abstract record available.
Inventors
- 👤 Calkins William Harold
- 👤 Squire Edward Noonan
- 👤 Ziegler Mandell Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:54
CPC Classifications
C; C08; C08F; C08F4/00; C08F2/00; C08F2/02; C08F2/38; C08F2/42; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/14; C08F265/00; C08F265/04; C08F265/06
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |