Patent US1690299A successfully refreshed from Google Patents.
US1690299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generation and control of electric waves
Assignee: AT&T Inc
•
Filing: 1922-03-21
•
Granted: 1928-11-06
•
Expires: 1942-03-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:03
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1931-11-06 | 1932-05-07 | 1932-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-11-06 | 1936-05-07 | 1936-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-11-06 | 1940-05-07 | 1940-11-06 | $7700.00 | Window Closed / Lapsed |