US2771595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage system
Assignee: Unisys Corp
•
Filing: 1950-12-30
•
Granted: 1956-11-20
•
Expires: 1970-12-30
Abstract
No abstract record available.
Inventors
- 👤 Arnold P Hendrickson
- 👤 William R Keye
- 👤 John H Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:06
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/16; G11B27/00; G11B27/10; G11B27/102; G11B27/19; G11B27/28; G11B27/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1694631A
Cited
US2124906A
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US2295000A
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US2282072A
Cited
US2397604A
Cited
US2540654A
Cited
US2564403A
Cited
US2533242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |