US3024220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyethylene terephthalate
Assignee: EIDP Inc
•
Filing: 1957-06-13
•
Granted: 1962-03-06
•
Expires: 1977-06-13
Abstract
No abstract record available.
Inventors
- 👤 Cramer Francis Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:36
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2465319A
Cited
US2578660A
Cited
US2647885A
Cited
BE545091A
Cited
BE545351A
Cited
BE552699A
Cited
BE549096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |