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US2875409A
Expired / Lapsed
US
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Electrical instrument
Assignee: Daystrom Inc
•
Filing: 1954-01-22
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Granted: 1959-02-24
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Expires: 1974-01-22
Abstract
No abstract record available.
Inventors
- 👤 Francis X Lamb
- 👤 Royden F Estoppey
- 👤 William A Roy
- 👤 Dempster Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:42
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2710377A
Cited
US1719556A
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US1835658A
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US1861720A
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US2353617A
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US2352049A
Cited
US2481276A
Cited
US2456667A
Cited
US2463844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |