US2901309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recorder for producing ferrographic images
Assignee: Individual
•
Filing: 1955-01-03
•
Granted: 1959-08-25
•
Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Atkinson
- 👤 Steven G Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:10
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/12; H04N1/16; H04N1/23; H04N1/27
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2188650A
Cited
US2677728A
Cited
US2621999A
Cited
US2704700A
Cited
US2717191A
Cited
US2771505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |