US2489654A
Expired / Lapsed
US
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Apparatus for colorimetric gas investigation
Assignee: Individual
•
Filing: 1945-05-08
•
Granted: 1949-11-29
•
Expires: 1965-05-08
Abstract
No abstract record available.
Inventors
- 👤 Main-Smith John David
- 👤 Dodd Sidney Arthur
- 👤 Sim James
- 👤 Lyon Herbert Anson
- 👤 Hillier George Henry
- 👤 Earwicker George Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:31
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2273; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/783; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US605991A
Cited
US1448901A
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US2018441A
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US2147607A
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GB433979A
Cited
US2234499A
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GB522942A
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US2333934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |