US2709238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control circuit
Assignee: Koehler Manufacturing Co
•
Filing: 1951-05-17
•
Granted: 1955-05-24
•
Expires: 1971-05-17
Abstract
No abstract record available.
Inventors
- 👤 Wheat Grant
- 👤 Homer A Lozeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:00
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96; H02J7/02; H02J7/04; H02J7/12; H02J7/971; H02J7/975; Y; Y10; Y10S; Y10S320/00; Y10S320/22; Y10S320/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1567797A
Cited
US2223737A
Cited
US2331131A
Cited
US2331411A
Cited
US2423114A
Cited
US2431312A
Cited
US2399266A
Cited
US2503039A
Cited
US2552203A
Cited
US2488711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |