Patent US2552981A successfully refreshed from Google Patents.
US2552981A
Expired / Lapsed
US
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Electrical testing apparatus
Assignee: Weston Electric Instrument Corp
•
Filing: 1947-02-13
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Granted: 1951-05-15
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Expires: 1967-02-13
Abstract
No abstract record available.
Inventors
- 👤 Anthony H Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:24
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06788
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1606063A
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US1528709A
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US1615788A
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US1593024A
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US1707051A
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US1888906A
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US1957802A
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US2156319A
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US2231660A
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US2290760A
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US2413521A
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US2418872A
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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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |