US3290692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic storage disc and drum
Assignee: Unisys Corp
•
Filing: 1962-08-07
•
Granted: 1966-12-06
•
Expires: 1982-08-07
Abstract
No abstract record available.
Inventors
- 👤 Jacoby Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A MAGNETIC DRUM COMPRISING: (A) A HOLLOW CYLINDRICAL BODY; (B) A THIN SHRINKABLE ELEMENT TIGHTLY SURROUNDING THE PERIPHERY OF SAID CYLINDRICAL BODY, AND (C) A MAGNETIC COATING ON SAID ELEMENT TO RECEIVE MAGNETIC RECORDINGS.
Claim 2
Dependent Claim
34 words
A MAGNETIC DRUM COMPRISING: (A) A HOLLOW CYLINDRICAL BODY; (B) A THIN SHRINKABLE ELEMENT TIGHTLY SURROUNDING THE PERIPHERY OF SAID CYLINDRICAL BODY, AND (C) A MAGNETIC COATING ON SAID ELEMENT TO RECEIVE MAGNETIC RECORDINGS.
References Cited (Backward Citations)
US2821155A
Cited
US3130110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |