US2617705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage apparatus
Assignee: Engineering Research Associates Inc
•
Filing: 1948-03-25
•
Granted: 1952-11-11
•
Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 John M Coombs
- 👤 Charles B Tompkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/74; G11B5/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1883907A
Cited
US2213246A
Cited
US2229293A
Cited
US2416090A
Cited
US2468224A
Cited
US2470839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |