Patent US2422129A successfully refreshed from Google Patents.
US2422129A
Expired / Lapsed
US
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Measurement of oxygen in gas mixtures
Assignee: Leeds and Northrup Co
•
Filing: 1942-02-19
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Granted: 1947-06-10
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Expires: 1962-02-19
Abstract
No abstract record available.
Inventors
- 👤 George A Perley
- 👤 James B Godshalk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:24
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/12; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/207497
Claims Analysis
Total Claims: 0
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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) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |