US3514771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum enclosure with heat transfer
Assignee: Unisys Corp
•
Filing: 1967-09-26
•
Granted: 1970-05-26
•
Expires: 1987-09-26
Abstract
No abstract record available.
Inventors
- 👤 Gregory J Ehalt
- 👤 William H Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:40
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/021; G11B5/00; G11B5/48; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2947957A
Cited
US2862120A
Cited
US3033537A
Cited
US3192306A
Cited
US3437965A
Cited
US3334684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |