US2013998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustible gas analyzer
Assignee: Doherty Research Co
•
Filing: 1931-04-28
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Granted: 1935-09-10
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Expires: 1951-04-28
Abstract
No abstract record available.
Inventors
- 👤 Winder E Goldsborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:10
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/20; G01N25/22; G01N25/28; G01N25/34; G01N25/36; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-09-09 | 1939-03-11 | 1939-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-09-09 | 1943-03-11 | 1943-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-09-09 | 1947-03-11 | 1947-09-10 | $7700.00 | Window Closed / Lapsed |