Patent US2515888A successfully refreshed from Google Patents.
US2863561A
Expired / Lapsed
US
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Stacked disk filter
Assignee: Screen Products Inc
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Filing: 1955-01-20
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Granted: 1958-12-09
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Expires: 1975-01-20
Abstract
No abstract record available.
Inventors
- 👤 Raymond H Just
- 👤 May Albert Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:44
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/22; B01D25/26; B01D29/00; B01D29/39; B01D29/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR878867A
Cited
DE905969C
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FR951478A
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US2444147A
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US2473979A
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DE827352C
Cited
DE827648C
Cited
US2788901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |