US2161570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system
Assignee: AT&T Inc
•
Filing: 1936-04-23
•
Granted: 1939-06-06
•
Expires: 1956-04-23
Abstract
No abstract record available.
Inventors
- 👤 Robert A Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:31
CPC Classifications
B; B21; B21C; B21C29/00; B21C29/04; Y; Y10; Y10S; Y10S62/00; Y10S62/10; Y10S82/00; Y10S82/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-06-05 | 1942-12-05 | 1943-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-05 | 1946-12-05 | 1947-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-05 | 1950-12-05 | 1951-06-06 | $7700.00 | Window Closed / Lapsed |