Patent US3153225A successfully refreshed from Google Patents.
US3450796A
Expired / Lapsed
US
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Production of thermoplastic polymeric materials
Assignee: Imperial Chemical Industries Ltd
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Filing: 1968-06-19
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Granted: 1969-06-17
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Expires: 1988-06-19
Abstract
No abstract record available.
Inventors
- 👤 Brian Philip Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:08
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; C08F285/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3041309A
Cited
US3251904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |