US2771278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling apparatus
Assignee: International Business Machines Corp
•
Filing: 1954-02-23
•
Granted: 1956-11-20
•
Expires: 1974-02-23
Abstract
No abstract record available.
Inventors
- 👤 Robert E Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:54
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/02; H01J5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR580039A
Cited
FR29315E
Cited
US1830414A
Cited
US1910486A
Cited
US2341752A
Cited
US2494131A
Cited
FR1035981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |