US2905768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air head
Assignee: International Business Machines Corp
•
Filing: 1954-09-24
•
Granted: 1959-09-22
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Expires: 1974-09-24
Abstract
No abstract record available.
Inventors
- 👤 Donald H Cronquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:13
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; Y; Y10; Y10S; Y10S425/00; Y10S425/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2710234A
Cited
US2612566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |