US2673339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas detector
Assignee: Individual
•
Filing: 1952-02-25
•
Granted: 1954-03-23
•
Expires: 1972-02-25
Abstract
No abstract record available.
Inventors
- 👤 James W Gray
- 👤 Thomas F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:09
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/50; G01N25/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US261384A
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US1150505A
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US977947A
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US1088611A
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US1107232A
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US1703497A
Cited
US1977481A
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US2125370A
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US2170056A
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US2219391A
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US2337330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |