US2680357A
Expired / Lapsed
US
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Method and means for treating gases
Assignee: Arthur D Little Inc
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Filing: 1951-05-26
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Granted: 1954-06-08
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Expires: 1971-05-26
Abstract
No abstract record available.
Inventors
- 👤 Samuel C Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:33
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/044; F25J3/04763; F25J3/04866; F25J3/04975; F25J3/04987; F25J5/00; F25J2200/00; F25J2200/70; F25J2205/00; F25J2205/24; F25J2215/00; F25J2215/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2239883A
Cited
US1951183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |