Patent US3480587A successfully refreshed from Google Patents.
US3480587A
Expired / Lapsed
US
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Polyester preparation
Assignee: Imperial Chemical Industries Ltd
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Filing: 1967-04-17
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Granted: 1969-11-25
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Kenneth Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:13
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2973341A
Cited
US3192184A
Cited
GB1001429A
Cited
US3167531A
Cited
US3359074A
Cited
US3241926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |