Patent US5569178A successfully refreshed from Google Patents.
Patent US2889892A successfully refreshed from Google Patents.
US2889892A
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Lock for the discharge of solids separated from gaseous media by means of cyclones
Assignee: Ruhrchemie AG
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Filing: 1957-07-02
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Granted: 1959-06-09
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Expires: 1977-07-02
Abstract
No abstract record available.
Inventors
- 👤 Schaub Franz
- 👤 Drope Winfried
- 👤 Hoffmann Wilfried Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:42
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/10; B; B04; B04C; B04C5/00; B04C5/14; B04C5/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
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US1922003A
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US2708489A
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AT177277B
Cited
US2792910A
Cited
US2760595A
Cited
US2804170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |