Patent US2920681A successfully refreshed from Google Patents.
US2920681A
Expired / Lapsed
US
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Solenoid control and tape forming machine
Assignee: 3M Co
•
Filing: 1955-05-11
•
Granted: 1960-01-12
•
Expires: 1975-05-11
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand W Humphner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:36
CPC Classifications
B; B41; B41K; B41K3/00; B41K3/62; B41K3/64; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1317; Y10T156/1343; Y10T83/00; Y10T83/444; Y10T83/4455; Y10T83/4539; Y10T83/4541; Y10T83/525; Y10T83/54
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |