US2482980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant voltage source
Assignee: Individual
•
Filing: 1946-04-06
•
Granted: 1949-09-27
•
Expires: 1966-04-06
Abstract
No abstract record available.
Inventors
- 👤 Heinz E Kallmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:43
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/017; H; H10; H10F; H10F99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1837905A
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US1971317A
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US1963185A
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FR722212A
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GB394853A
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US2073790A
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US2122818A
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US2190200A
Cited
US2239362A
Cited
US2233879A
Cited
US2185690A
Cited
US2304191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-26 | 1953-03-28 | 1953-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-26 | 1957-03-28 | 1957-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-26 | 1961-03-28 | 1961-09-27 | $7700.00 | Window Closed / Lapsed |