US2712859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal gas cleaning device
Assignee: Research Corp
•
Filing: 1952-04-30
•
Granted: 1955-07-12
•
Expires: 1972-04-30
Abstract
No abstract record available.
Inventors
- 👤 Harry A Wintermute
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:51
CPC Classifications
B; B04; B04C; B04C3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2188206A
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US1094107A
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US2010456A
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US2323707A
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GB555908A
Cited
US2370629A
Cited
US2480243A
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US2506298A
Cited
US2515894A
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US2569909A
Cited
US2659451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-11 | 1959-01-10 | 1959-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-11 | 1963-01-10 | 1963-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-11 | 1967-01-10 | 1967-07-12 | $7700.00 | Window Closed / Lapsed |