Patent US3241678A successfully refreshed from Google Patents.
US3241678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous structures
Assignee: MARINE MIDLAND BANK NA
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Filing: 1961-12-13
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Granted: 1966-03-22
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Expires: 1981-12-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Wrotnowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/12; B01D25/21; B01D25/215; B01D25/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A FILTER PLATE ASSEMBLY FOR A FILTER PRESS COMPRISING IN COMBINATION, A CENTRAL PLATE MEMBER OF PLASTIC BONDED FIBER, SPACED TRANSVERSE PASSAGE MEANS ARRANGED IN AND EXTENDING THROUGH SAID PLATE MEMBER ADJACENT THE PERIPHERY THEREOF, A FRAME MEMBER ON EACH SIDE OF SAID PLATE MEMBER, GENERALLY CORRESPONDING IN SHAPE WITH SAID PLATE MEMBER, EACH FRAME MEMBER BEING OF PLASTIC BONDED FIBER AND HAVING AN INNER PERIPHERY DEFINING A POCKET THEREIN, SPACED TRANSVERSE THROUGH PASSAGE MEANS IN SAID FRAME MEMBERS IN ALIGNMENT WITH SAID PASSAGE MEANS IN SAID PLATE MEMBER, PLASTIC LATTICE DRAINAGE MEMBERS REMOVALBLY ARRANGED IN SAID POCKETS AND BEING OF SUBSTANTIALLY THE SAME THICKNESS AS SAID FRAME MEMBERS AND BEING COEXTENSIVE WITH SAID POCKETS, SAID LATTICE MEMBERS BEING SEPARATED FROM EACH OTHER AND SAID CENTRAL PLATE, AND FIBER FILTER SHEETS ARRANGED ON ONE SIDE OF AND ATTACHED TO SAID FRAME MEMBERS, SAID FILTERS SHEETS HAVING SPACED TRANSVERSE THROUGH PASSAGE MEANS THEREIN IN ALIGNMENT WITH SAID THROUGH PASSAGE MEANS IN SAID FRAME MEMBERS AND SAID CENTRAL PLATE MEMBER.
Claim 2
Dependent Claim
168 words
A FILTER PLATE ASSEMBLY FOR A FILTER PRESS COMPRISING IN COMBINATION, A CENTRAL PLATE MEMBER OF PLASTIC BONDED FIBER, SPACED TRANSVERSE PASSAGE MEANS ARRANGED IN AND EXTENDING THROUGH SAID PLATE MEMBER ADJACENT THE PERIPHERY THEREOF, A FRAME MEMBER ON EACH SIDE OF SAID PLATE MEMBER, GENERALLY CORRESPONDING IN SHAPE WITH SAID PLATE MEMBER, EACH FRAME MEMBER BEING OF PLASTIC BONDED FIBER AND HAVING AN INNER PERIPHERY DEFINING A POCKET THEREIN, SPACED TRANSVERSE THROUGH PASSAGE MEANS IN SAID FRAME MEMBERS IN ALIGNMENT WITH SAID PASSAGE MEANS IN SAID PLATE MEMBER, PLASTIC LATTICE DRAINAGE MEMBERS REMOVALBLY ARRANGED IN SAID POCKETS AND BEING OF SUBSTANTIALLY THE SAME THICKNESS AS SAID FRAME MEMBERS AND BEING COEXTENSIVE WITH SAID POCKETS, SAID LATTICE MEMBERS BEING SEPARATED FROM EACH OTHER AND SAID CENTRAL PLATE, AND FIBER FILTER SHEETS ARRANGED ON ONE SIDE OF AND ATTACHED TO SAID FRAME MEMBERS, SAID FILTERS SHEETS HAVING SPACED TRANSVERSE THROUGH PASSAGE MEANS THEREIN IN ALIGNMENT WITH SAID THROUGH PASSAGE MEANS IN SAID FRAME MEMBERS AND SAID CENTRAL PLATE MEMBER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |