US1501649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer
Assignee: AT&T Inc
•
Filing: 1919-12-26
•
Granted: 1924-07-15
•
Expires: 1939-12-26
Abstract
No abstract record available.
Inventors
- 👤 George C Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:49
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/02
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) | 1927-07-15 | 1928-01-14 | 1928-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-07-15 | 1932-01-14 | 1932-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-07-15 | 1936-01-14 | 1936-07-15 | $7700.00 | Window Closed / Lapsed |