US3912632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter device
Assignee: Brunswick Corp
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Filing: 1972-05-10
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Granted: 1975-10-14
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Expires: 1992-05-10
Abstract
Abstract The invention relates to a continuous and controlled filter device that filters gases and liquids while maintaining a low differential pressure across the filter element. The device automatically advances clean filter medium into the filter seat or window when the differential pressure rises to a predetermined level replacing dirty filter medium with clean filter medium.
Inventors
- 👤 John P Winzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:32
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/42; B01D46/44; B01D46/46; B01D29/00; B01D29/09; B01D29/60; B01D29/606; B01D46/18; B01D46/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A FILTER DEVICE COMPRISING: A STRIP FILTER MEDIUM HAVING A PREFORATED EDGE THEREON, A TAKE-UP SPOOL FOR HOLDING USED STRIP FILTER MEDIUM, A PRESSURE SENSING ELECTRICAL BRIDGE DISPOSED TO MEASURE DIFFERENTIAL PRESSURE ACROSS THE STRIP FILTER MEDIUM, A LOGIC CIRCUIT FOR READING THE DIFFERENTIAL PRESSURE, DRIVE MENAS DIRECTLY CONNECTED TO THE PERFORATED EDGE OF THE STRIP FILTER MEDIUM FOR MOVING SAID MEDIUM FROM SAID SUPPLY SPOOL TO SAID TAKE-UP SPOOL, AND, MEANS INTERCONNECTING SAID LOGIC CIRCUIT TO SAID DRIVE MEANS FOR ENERGIZING SAID DRIVE MEANS FOR AUTOMATICALLY MOVING THE MEDIUM WHEN THE DIFFERENTIAL PRESSURE READ BY SAID LOGIC CIRCUIT IS ABOVE A PREDETERMINED LEVEL AND MEANS FOR
Claim 2
Dependent Claim
107 words
A FILTER DEVICE COMPRISING: A STRIP FILTER MEDIUM HAVING A PREFORATED EDGE THEREON, A TAKE-UP SPOOL FOR HOLDING USED STRIP FILTER MEDIUM, A PRESSURE SENSING ELECTRICAL BRIDGE DISPOSED TO MEASURE DIFFERENTIAL PRESSURE ACROSS THE STRIP FILTER MEDIUM, A LOGIC CIRCUIT FOR READING THE DIFFERENTIAL PRESSURE, DRIVE MENAS DIRECTLY CONNECTED TO THE PERFORATED EDGE OF THE STRIP FILTER MEDIUM FOR MOVING SAID MEDIUM FROM SAID SUPPLY SPOOL TO SAID TAKE-UP SPOOL, AND, MEANS INTERCONNECTING SAID LOGIC CIRCUIT TO SAID DRIVE MEANS FOR ENERGIZING SAID DRIVE MEANS FOR AUTOMATICALLY MOVING THE MEDIUM WHEN THE DIFFERENTIAL PRESSURE READ BY SAID LOGIC CIRCUIT IS ABOVE A PREDETERMINED LEVEL AND MEANS FOR
Claim 3
Dependent Claim
117 words
a filter device comprising: a filter strip medium having continuous edge indentations; a differential pressure sensor disposed to measure the differential pressure across said filter strip medium, and advancement means operably associated with said differential pressure sensor for advancing said filter strip medium until the differential pressure is reduced to a predetermined level, said advancement means including: a gear engaging said medium and having prongs thereon that mate with the indentations on said medium; a drive mechanism to rotate said gear, and means associated with said differential pressure sensor foR moving into and out of the engagement with said indentations to permit said drive mechanism to rotate said gear on disengagement of said means from said indentations.
Claim 4
Dependent Claim
117 words
a filter device comprising: a filter strip medium having continuous edge indentations; a differential pressure sensor disposed to measure the differential pressure across said filter strip medium, and advancement means operably associated with said differential pressure sensor for advancing said filter strip medium until the differential pressure is reduced to a predetermined level, said advancement means including: a gear engaging said medium and having prongs thereon that mate with the indentations on said medium; a drive mechanism to rotate said gear, and means associated with said differential pressure sensor foR moving into and out of the engagement with said indentations to permit said drive mechanism to rotate said gear on disengagement of said means from said indentations.
Claim 5
Dependent Claim
108 words
A filter device comprising a filter strip medium mounted on a supply spool and take-up spool, a differential pressure sensor disposed to measure the differential pressure across said filter strip medium, and advancement means operably associated with said differential pressure sensor for advancing said filter strip medium until the differential pressure is reduced to a predetermined level, wherein said advancement means includes a drive mechanism for driving said take-up spool; a gear having sprocket pins mounted thereon for engaging said filter strip medium, and an escapement mounted for pivotal movement into and out of engagement with said sprocket pins in response to movement of said differential pressure sensor.
Claim 6
Dependent Claim
108 words
A filter device comprising a filter strip medium mounted on a supply spool and take-up spool, a differential pressure sensor disposed to measure the differential pressure across said filter strip medium, and advancement means operably associated with said differential pressure sensor for advancing said filter strip medium until the differential pressure is reduced to a predetermined level, wherein said advancement means includes a drive mechanism for driving said take-up spool; a gear having sprocket pins mounted thereon for engaging said filter strip medium, and an escapement mounted for pivotal movement into and out of engagement with said sprocket pins in response to movement of said differential pressure sensor.
Claim 7
Independent Claim
135 words
A device for detecting the rate of change of contaminant levels on a movable filter strip medium comprising: a filter strip medium located in the stream of a fluid containing contaminants, a supply spool for holding a roll of said filter strip medium, a take-up spool for holding used filter strip medium, means for measuring the increase of the differential pressure across said filter strip medium, caused by contaminants filtered from the fluid, means operably associated with said measuring means and in direct contact with said medium for moving said medium from said supply spool to said take-up spool when the differential pressure is increased above a predetermined level, and means for timing the intervals between movements of said filter strip medium for detecting the rate of change of the contaminant level in said fluid.
Claim 8
Independent Claim
135 words
A device for detecting the rate of change of contaminant levels on a movable filter strip medium comprising: a filter strip medium located in the stream of a fluid containing contaminants, a supply spool for holding a roll of said filter strip medium, a take-up spool for holding used filter strip medium, means for measuring the increase of the differential pressure across said filter strip medium, caused by contaminants filtered from the fluid, means operably associated with said measuring means and in direct contact with said medium for moving said medium from said supply spool to said take-up spool when the differential pressure is increased above a predetermined level, and means for timing the intervals between movements of said filter strip medium for detecting the rate of change of the contaminant level in said fluid.
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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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |