Patent US2972126A successfully refreshed from Google Patents.
US2972126A
Expired / Lapsed
US
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Voltage classifier
Assignee: Sheffield Corp
•
Filing: 1955-10-10
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Granted: 1961-02-14
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Expires: 1975-10-10
Abstract
No abstract record available.
Inventors
- 👤 Hecox William
- 👤 Carl C Gebhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:56
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2497961A
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US2648057A
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US2843839A
Cited
US2715718A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |