Patent US2587755A successfully refreshed from Google Patents.
US2587755A
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Frequency measuring or indicating apparatus
Assignee: HP Inc
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Filing: 1948-03-06
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Granted: 1952-03-04
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Expires: 1968-03-06
Abstract
No abstract record available.
Inventors
- 👤 Packard David
- 👤 Norman B Schrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:32
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R23/06; G01R23/09; G01R29/00; G01R29/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1809683A
Cited
US2119389A
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US2377363A
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US2362503A
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US2358480A
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US2432390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |