US2489893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for purifying and feeding sample gas
Assignee: Elsag Bailey Inc
•
Filing: 1944-08-04
•
Granted: 1949-11-29
•
Expires: 1964-08-04
Abstract
No abstract record available.
Inventors
- 👤 Johnson Clarence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:22
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/34; G01N1/02; G01N1/22; G01N1/40; G01N1/4055; G01N2001/4066; Y; Y10; Y10S; Y10S261/00; Y10S261/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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DE641892C
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US2090994A
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US2323525A
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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) | 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 |