US3237771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-sensitive filter and flow monitor
Assignee: Fram Corp
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Filing: 1963-09-06
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Granted: 1966-03-01
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Expires: 1983-09-06
Abstract
No abstract record available.
Inventors
- 👤 Robert G Greenawalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:09
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/147; B01D17/00; B01D17/02; B01D17/0202; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/232; B01D29/88; B01D29/92; B01D36/00; B01D36/003; Y; Y10; Y10S; Y10S210/00; Y10S210/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A WATER-SENSITIVE FILTER AND FLOW MONITOR, COMPRISING A FILTER HOUSING HAVING A FLUID INLET AT ONE END AND A FLUID OUTLET AT THE OTHER END, A VALVE SEAT NEAR SAID OUTLET, AN ANNULAR PLEATED PAPER FILTER ELEMENT HAVING THE PLEATS EXTENDING AXIALLY AND FORMED OF WATER-SENSITIVE PAPER THAT WILL EXPAND IN THE DIRECTION IN WHICH THE PLEATS EXTEND WHEN THE PAPER ABSORBS WATER, MEANS FOR ANCHORING ONE END OF THE FILTER ELEMENT TO THE INLET PORTION OF THE HOUSING SO THAT THE OTHER END OF THE ELEMENT IS FREE TO MOVE, AND A VALVE ATTACHED TO THE FREE END OF SAID ELEMENT AND POSITIONED TO BE MOVED INTO FLUID-CLOSING ENGAGEMENT WITH SAID SEAT WHEN THE PLEATS ABSORB WATER AND EXPAND LENGTHWISE.
Claim 2
Dependent Claim
121 words
A WATER-SENSITIVE FILTER AND FLOW MONITOR, COMPRISING A FILTER HOUSING HAVING A FLUID INLET AT ONE END AND A FLUID OUTLET AT THE OTHER END, A VALVE SEAT NEAR SAID OUTLET, AN ANNULAR PLEATED PAPER FILTER ELEMENT HAVING THE PLEATS EXTENDING AXIALLY AND FORMED OF WATER-SENSITIVE PAPER THAT WILL EXPAND IN THE DIRECTION IN WHICH THE PLEATS EXTEND WHEN THE PAPER ABSORBS WATER, MEANS FOR ANCHORING ONE END OF THE FILTER ELEMENT TO THE INLET PORTION OF THE HOUSING SO THAT THE OTHER END OF THE ELEMENT IS FREE TO MOVE, AND A VALVE ATTACHED TO THE FREE END OF SAID ELEMENT AND POSITIONED TO BE MOVED INTO FLUID-CLOSING ENGAGEMENT WITH SAID SEAT WHEN THE PLEATS ABSORB WATER AND EXPAND LENGTHWISE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |