Patent US2702207A successfully refreshed from Google Patents.
US2702207A
Expired / Lapsed
US
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Multiple lift for elevating granular solids
Assignee: Houdry Process Corp
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Filing: 1951-05-16
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Granted: 1955-02-15
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Expires: 1971-05-16
Abstract
No abstract record available.
Inventors
- 👤 Robert M Shirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:13
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL7075C
Cited
US528417A
Cited
US1390974A
Cited
GB180397A
Cited
US1549285A
Cited
US1846069A
Cited
US2561771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |