Patent US2458601A successfully refreshed from Google Patents.
US2458601A
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US
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Method of and apparatus for measuring pressure
Assignee: AT&T Inc
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Filing: 1944-03-24
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Granted: 1949-01-11
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Expires: 1964-03-24
Abstract
No abstract record available.
Inventors
- 👤 John B Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US857388A
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US1377282A
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US1697339A
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US1789557A
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US1984482A
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US1957778A
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US1983669A
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US2058846A
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US2088218A
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US2169605A
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US2340837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |