Patent US2988772A successfully refreshed from Google Patents.
US2988772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film stretching
Assignee: Celanese Corp
•
Filing: 1958-05-26
•
Granted: 1961-06-20
•
Expires: 1978-05-26
Abstract
No abstract record available.
Inventors
- 👤 Harvey S Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/16; B29C55/165; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1280139A
Cited
US2350961A
Cited
US2557492A
Cited
US2582165A
Cited
US2719323A
Cited
US2755533A
Cited
US2778057A
Cited
US2895171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |