US2881971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Letter-envelop unit
Assignee: Individual
•
Filing: 1955-06-14
•
Granted: 1959-04-14
•
Expires: 1975-06-14
Abstract
No abstract record available.
Inventors
- 👤 Tolve James V De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:43
CPC Classifications
B; B42; B42D; B42D15/00; B42D15/02; B42D15/04; B42D15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US267305A
Cited
US1434097A
Cited
US1985194A
Cited
DE660259C
Cited
US2366575A
Cited
FR52618E
Cited
US2391673A
Cited
US2631773A
Cited
US2773638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |