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Patent US2994037A successfully refreshed from Google Patents.
US2994037A
Expired / Lapsed
US
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Phase comparator utilizing hall effect
Assignee: Robertshaw Controls Co
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Filing: 1959-09-21
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Granted: 1961-07-25
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Expires: 1979-09-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Eugene J Boyle
- 👤 Robert G Mcmichael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:58
CPC Classifications
G; G01; G01R; G01R25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1778795A
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US2595675A
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US2436479A
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US2545369A
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US2543640A
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US2749516A
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US2788491A
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US2760155A
Cited
GB802214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |