US2511195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording pen check mechanism
Assignee: AT&T Inc
•
Filing: 1948-04-30
•
Granted: 1950-06-13
•
Expires: 1968-04-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Buhrendorf
- 👤 Dermond Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:54
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/16; Y; Y10; Y10T; Y10T74/00; Y10T74/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2424776A
Cited
US2426301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |