Patent US2841476A successfully refreshed from Google Patents.
US2841476A
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Apparatus for contacting solids with gases
Assignee: Dorr Oliver Inc
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Filing: 1953-07-16
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Granted: 1958-07-01
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Expires: 1973-07-16
Abstract
No abstract record available.
Inventors
- 👤 Benjamin S Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:56
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2444990A
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US2378157A
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US2607662A
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US2580827A
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US2556301A
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US2639973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |