US2894635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing means for rotary drum filters
Assignee: Dorr Oliver Inc
•
Filing: 1956-07-23
•
Granted: 1959-07-14
•
Expires: 1976-07-23
Abstract
No abstract record available.
Inventors
- 👤 Harold J Irthum
- 👤 Frederick L Schorken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:05
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/46; B; B01; B01D; B01D33/00; B01D33/06; B01D33/067; B01D33/073; D; D21; D21C; D21C9/00; D21C9/18; F16J15/16; F16J15/34; F16J15/3436; F16J15/3448; B01D2201/00; B01D2201/28; B01D2201/282; B01D2201/34; Y; Y10; Y10S; Y10S277/00; Y10S277/903; Y10S277/918
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US358749A
Cited
US2736265A
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GB208928A
Cited
US1619484A
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US1633121A
Cited
US2109679A
Cited
US2725145A
Cited
US2760791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-13 | 1963-01-12 | 1963-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-13 | 1967-01-12 | 1967-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-13 | 1971-01-12 | 1971-07-14 | $7700.00 | Window Closed / Lapsed |