US1666533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Envelope opener
Assignee: Individual
•
Filing: 1927-05-12
•
Granted: 1928-04-17
•
Expires: 1947-05-12
Abstract
No abstract record available.
Inventors
- 👤 Clarence P Heck
- 👤 John R Sater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:59
CPC Classifications
B; B43; B43M; B43M7/00; B43M7/008; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8776; Y10T83/8778; Y10T83/8798; Y10T83/8817; Y10T83/8818; Y10T83/882
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) | 1931-04-17 | 1931-10-17 | 1932-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-04-17 | 1935-10-17 | 1936-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-04-17 | 1939-10-17 | 1940-04-17 | $7700.00 | Window Closed / Lapsed |