US2472930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating unit
Assignee: AT&T Inc
•
Filing: 1945-08-23
•
Granted: 1949-06-14
•
Expires: 1965-08-23
Abstract
No abstract record available.
Inventors
- 👤 Donald P Wilkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:51
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; H05B3/66; H05B3/40; H05B3/42; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12326; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1023485A
Cited
US1180614A
Cited
US1226471A
Cited
US1539266A
Cited
US2281843A
Cited
US2298254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |