US1624665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: AT&T Inc
•
Filing: 1925-01-31
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Granted: 1927-04-12
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Expires: 1945-01-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth S Johnson
- 👤 Timothy E Shea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:16
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/17; H03H7/1741; H03H7/175; H03H7/0115; H03H7/1708; H03H7/1766; H03H7/1775; H03H7/1783
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) | 1930-04-11 | 1930-10-11 | 1931-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-04-11 | 1934-10-11 | 1935-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-04-11 | 1938-10-11 | 1939-04-12 | $7700.00 | Window Closed / Lapsed |