Patent US2988720A successfully refreshed from Google Patents.
US2988720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control rheostat
Assignee: Individual
•
Filing: 1957-08-12
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Granted: 1961-06-13
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Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Peter H Voorias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:47
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1550909A
Cited
US1514546A
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US1777988A
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US1614887A
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US1988796A
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US2117257A
Cited
US2333814A
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US2472604A
Cited
US2424529A
Cited
US2536012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |