Patent US2455437A successfully refreshed from Google Patents.
US2455437A
Expired / Lapsed
US
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Ionization gauge circuits
Assignee: Distillation Products Inc
•
Filing: 1943-11-13
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Granted: 1948-12-07
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Expires: 1963-11-13
Abstract
No abstract record available.
Inventors
- 👤 Gerhard R Nagel
- 👤 Merriam E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:07
CPC Classifications
G; G01; G01L; G01L21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1372798A
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US1649016A
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US1334143A
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US1566279A
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US1931763A
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US1969518A
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US2099349A
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US2122267A
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US2167842A
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US2235173A
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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) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |