US2972082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage method and apparatus
Assignee: Research Corp
•
Filing: 1955-02-14
•
Granted: 1961-02-14
•
Expires: 1975-02-14
Abstract
No abstract record available.
Inventors
- 👤 Hartmut P Kallmann
- 👤 Rosenberg Barnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:43
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/08; G11B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2543039A
Cited
US2589704A
Cited
US2698928A
Cited
US2747131A
Cited
GB692337A
Cited
US2747132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |