US2838800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic sheet material
Assignee: Celanese Corp
•
Filing: 1953-12-18
•
Granted: 1958-06-17
•
Expires: 1973-12-18
Abstract
No abstract record available.
Inventors
- 👤 David B Hertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:12
CPC Classifications
B; B29; B29D; B29D7/00; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; Y; Y10; Y10S; Y10S264/00; Y10S264/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2563394A
Cited
US891687A
Cited
US1610954A
Cited
US2239780A
Cited
US2176153A
Cited
US2333143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |