US2612950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for perforating elastic sheet material
Assignee: Celanese Corp
•
Filing: 1947-02-04
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Granted: 1952-10-07
•
Expires: 1967-02-04
Abstract
No abstract record available.
Inventors
- 👤 Ewing Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:29
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/0084; B26D; B26D7/00; B26D7/08; B26D7/14; B26F1/02; Y; Y10; Y10T; Y10T83/00; Y10T83/323; Y10T83/444; Y10T83/4594; Y10T83/647; Y10T83/664
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US915537A
Cited
GB191101501A
Cited
US1048560A
Cited
US1441359A
Cited
US1905446A
Cited
US2143507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |