Patent US1963873A successfully refreshed from Google Patents.
US1963873A
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US
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Envelope opening device
Assignee: CARL C CAVANAH
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Filing: 1932-09-28
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Granted: 1934-06-19
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Expires: 1952-09-28
Abstract
No abstract record available.
Inventors
- 👤 Frank H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:08
CPC Classifications
B; B43; B43M; B43M7/00; B43M7/007; Y; Y10; Y10S; Y10S30/00; Y10S30/03; Y10T; Y10T83/00; Y10T83/566; Y10T83/5815; Y10T83/5842; Y10T83/5851; Y10T83/869; Y10T83/8752; Y10T83/8755; Y10T83/8776; Y10T83/8778
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-06-18 | 1937-12-18 | 1938-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-06-18 | 1941-12-18 | 1942-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-06-18 | 1945-12-18 | 1946-06-19 | $7700.00 | Window Closed / Lapsed |