Patent US20030171774A1 successfully refreshed from Google Patents.
US2849615A
Expired / Lapsed
US
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Circuit arrangement for converting a low voltage into a high a. c. voltage
Assignee: CONTRONICS Inc
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Filing: 1957-06-17
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Granted: 1958-08-26
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Expires: 1977-06-17
Abstract
No abstract record available.
Inventors
- 👤 Darrel W Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:44
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1206; H03B5/1218; H03B5/1231; H03B5/1296
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |