Patent US2609423A successfully refreshed from Google Patents.
US2609423A
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Electrical apparatus for vacuum measurement
Assignee: Heraeus Noblelight Analytics Ltd
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Filing: 1946-05-08
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Granted: 1952-09-02
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Expires: 1966-05-08
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:04
CPC Classifications
G; G01; G01L; G01L21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1356687A
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US1465394A
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US1372798A
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US1649016A
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US1421720A
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US1566279A
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US2217198A
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US2375280A
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US2455437A
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US2442518A
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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) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |