US3020489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic device
Assignee: International Business Machines Corp
•
Filing: 1958-12-24
•
Granted: 1962-02-06
•
Expires: 1978-12-24
Abstract
No abstract record available.
Inventors
- 👤 Robert M Walker
- 👤 Eugene S Schlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:14
CPC Classifications
H; H10; H10N; H10N60/00; G; G11; G11C; G11C11/00; G11C11/21; G11C11/44; H03; H03F; H03F19/00; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/855; Y10S505/856; Y10S505/857; Y10S505/863
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2832897A
Cited
US2935694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |