US2833987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanceable saturable reactor
Assignee: Individual
•
Filing: 1954-04-12
•
Granted: 1958-05-06
•
Expires: 1974-04-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Francis H Shepard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:31
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/02; H01F38/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US671730A
Cited
US1929259A
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US2175039A
Cited
US2218642A
Cited
US2554575A
Cited
US2511233A
Cited
US2477057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |