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Patent US3332215A successfully refreshed from Google Patents.
US3332215A
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Method and apparatus for advancing a web of filter in gas filters
Assignee: American Air Filter Co Inc
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Filing: 1963-11-01
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Granted: 1967-07-25
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Expires: 1983-11-01
Abstract
No abstract record available.
Inventors
- 👤 Alan E Revell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:07
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A FILTER MEDIUM ADVANCE CONTROL SYSTEM FOR GAS FILTER APPARATUS WHEREIN ADVANCE OF A WEB OF FILTER MEDIUM FROM A SUPPLY ZONE THEREOF THROUGH A GAS FILTERING ZONE IS EFFECTED BY REWINDING SAID FILTER MEDIUM ON A REWIND SPOOL IN A DISCHARGE ZONE COMPRISING: (A) DRIVE MEANS TO ROTATE SAID REWIND SPOOL; (B) A DIFFERENTIAL PRESSURE-SENSING CONTROL MEANS CONNECTED TO SAID DRIVE MEANS, SAID CONTROL MEANS BEING RESPONSIVE TO A PRESELECTED STATIC PRESSURE DIFFERENTIAL IN SAID GAS FILTERING ZONE MEASURED BETWEEN A POSITION UPSTREAM AND A POSITION DOWNSTREAM SAID FILTER MEDIUM TO ACTUATE SAID DRIVE MEANS AND ADVANCE SAID FILTER MEDIUM IN RELATIONSHIP TO SUCH PRESSURE DIFFERENTIAL; AND, (C) CALIBRATING MEANS CONNECTED TO SAID DIFFERENTIAL PRESSURE-SENSING CONTROL MEANS RESPONSIVE TO VARIATIONS IN THE VELOCITY PRESSURE IN SAID GAS FILTERING ZONE TO CALIBRATE SAID DIFFERENTIAL PRESSURE-SENSING CONTROL MEANS IN RELATIONSHIP TO THE VARIATIONS IN THE VELOCITY PRESSURE.
Claim 2
Dependent Claim
146 words
A FILTER MEDIUM ADVANCE CONTROL SYSTEM FOR GAS FILTER APPARATUS WHEREIN ADVANCE OF A WEB OF FILTER MEDIUM FROM A SUPPLY ZONE THEREOF THROUGH A GAS FILTERING ZONE IS EFFECTED BY REWINDING SAID FILTER MEDIUM ON A REWIND SPOOL IN A DISCHARGE ZONE COMPRISING: (A) DRIVE MEANS TO ROTATE SAID REWIND SPOOL; (B) A DIFFERENTIAL PRESSURE-SENSING CONTROL MEANS CONNECTED TO SAID DRIVE MEANS, SAID CONTROL MEANS BEING RESPONSIVE TO A PRESELECTED STATIC PRESSURE DIFFERENTIAL IN SAID GAS FILTERING ZONE MEASURED BETWEEN A POSITION UPSTREAM AND A POSITION DOWNSTREAM SAID FILTER MEDIUM TO ACTUATE SAID DRIVE MEANS AND ADVANCE SAID FILTER MEDIUM IN RELATIONSHIP TO SUCH PRESSURE DIFFERENTIAL; AND, (C) CALIBRATING MEANS CONNECTED TO SAID DIFFERENTIAL PRESSURE-SENSING CONTROL MEANS RESPONSIVE TO VARIATIONS IN THE VELOCITY PRESSURE IN SAID GAS FILTERING ZONE TO CALIBRATE SAID DIFFERENTIAL PRESSURE-SENSING CONTROL MEANS IN RELATIONSHIP TO THE VARIATIONS IN THE VELOCITY PRESSURE.
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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |