Patent US1237834A successfully refreshed from Google Patents.
US2853151A
Expired / Lapsed
US
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Electrified centrifugal dust separating device
Assignee: Research Corp
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Filing: 1955-12-06
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Granted: 1958-09-23
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Expires: 1975-12-06
Abstract
No abstract record available.
Inventors
- 👤 Guldemond John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:50
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/06; B03C3/14; B03C3/34; B03C3/36; Y; Y10; Y10S; Y10S55/00; Y10S55/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |