US3526884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dustproof magnetic discs housing
Assignee: International Business Machines Corp
•
Filing: 1965-04-26
•
Granted: 1970-09-01
•
Expires: 1985-04-26
Abstract
No abstract record available.
Inventors
- 👤 Walter S Buslik
- 👤 Marshall E Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:10
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/03; G11B23/00; G11B23/02; G11B23/03; G11B23/032; G11B23/0321; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |