US2136609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device and a method of making the same
Assignee: AT&T Inc
•
Filing: 1936-04-10
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Granted: 1938-11-15
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Expires: 1956-04-10
Abstract
No abstract record available.
Inventors
- 👤 Louis B Butterfield
- 👤 Robert F Garrett
- 👤 Jr Robert E Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:47
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/12; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/49; Y10T29/49002; Y10T29/4902
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) | 1941-11-14 | 1942-05-16 | 1942-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-11-14 | 1946-05-16 | 1946-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-11-14 | 1950-05-16 | 1950-11-15 | $7700.00 | Window Closed / Lapsed |