US2540654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage system
Assignee: Engineering Research Associates Inc
•
Filing: 1948-03-25
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Granted: 1951-02-06
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Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 Arnold A Cohen
- 👤 William R Keye
- 👤 Charles B Tompkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/76; B; B41; B41J; B41J3/00; B41J3/44; B41J3/50; G01; G01B; G01B7/00; G01C; G01C1/00; G01C1/02; G01C1/06; G11B5/004; H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |