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Patent US2168394A successfully refreshed from Google Patents.
US2168394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for opening envelopes
Assignee: Individual
•
Filing: 1938-02-09
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Granted: 1939-08-08
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Expires: 1958-02-09
Abstract
No abstract record available.
Inventors
- 👤 Coleman Alfred Montague
- 👤 Bater Charles Claude
- 👤 Lee George Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:37
CPC Classifications
B; B43; B43M; B43M7/00; B43M7/005; Y; Y10; Y10T; Y10T83/00; Y10T83/647; Y10T83/6571; Y10T83/6572; Y10T83/6584; Y10T83/6592; Y10T83/768; Y10T83/7684; Y10T83/7722
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) | 1942-08-07 | 1943-02-06 | 1943-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-07 | 1947-02-06 | 1947-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-07 | 1951-02-06 | 1951-08-08 | $7700.00 | Window Closed / Lapsed |