Patent US3446358A successfully refreshed from Google Patents.
US3446358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for separating plates and frames of filter presses
Assignee: D R Sperry and Co
•
Filing: 1966-06-23
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Granted: 1969-05-27
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Expires: 1986-06-23
Abstract
No abstract record available.
Inventors
- 👤 Russell F Kratochvil
- 👤 William C Eggert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:02
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/12; B01D25/172
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL62149C
Cited
US672505A
Cited
US734898A
Cited
FR526983A
Cited
GB802911A
Cited
GB1003954A
Cited
US3232435A
Cited
FR1349962A
Cited
US3251472A
Cited
US3344922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |