Patent US3071914A successfully refreshed from Google Patents.
US3071914A
Expired / Lapsed
US
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Assignee: General Electric Co
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Filing: 1960-10-03
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Granted: 1963-01-08
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Expires: 1980-10-03
Abstract
No abstract record available.
Inventors
- 👤 Gesmar Jorgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:02
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0084; B01D46/0086; F; F24; F24F; F24F8/00; F24F8/10; F24F8/108; B01D2273/00; B01D2273/30; Y; Y10; Y10S; Y10S116/00; Y10S116/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A FILTER FAN COMPRISING A CASING HAVING AN AIR INLET OPENING AND AN AIR EXHAUST OPENING; A FAN MOUNTED IN SAID CASING FOR MOVING AIR IN SAID INLET OPENING AND OUT SAID EXHAUST OPENING; A FILTER POSITIONED IN SAID CASING FOR FILTERING THE AIR PASSING THERETHROUGH; A HOLLOW INDICATOR TUBE HAVING AN OPEN LOWER END IN COMMUNICATION WITH ATMOSPHERIC AIR OUTSIDE OF SAID CASING AND A CLOSED UPPER END; A HOLLOW CONNECTING TUBE INTEGRALLY FORMED WITH SAID INDICATOR TUBE HAVING ONE OF ITS ENDS IN AIR COMMUNICATION WITH THE UPPER END OF SAID INDICATOR TUBE, THE OTHER END OF SAID CONNECTING TUBE EXTENDING INTO SAID CASING FOR TRANSMITTING THE AIR PRESSURE IN SAID CASING TO THE UPPER END OF SAID INDICATOR TUBE; AND A FLOAT ARRANGED FOR MOVEMENT IN SAID INDICATOR TUBE, SAID FLOAT HAVING AN OBSERVABLE POSITION AT THE UPPER END OF SAID INDICATOR TUBE AND AN OBSERVABLE POSITION AT THE LOWER END OF THE INDICATOR TUBE AND BEING INSTANTANEOUSLY MOVABLE FROM ONE OF SAID POSITIONS TO THE OTHER ONE OF SAID POSITIONS FOR INDICATING THE CONDITION OF THE FILTER.
Claim 2
Dependent Claim
181 words
A FILTER FAN COMPRISING A CASING HAVING AN AIR INLET OPENING AND AN AIR EXHAUST OPENING; A FAN MOUNTED IN SAID CASING FOR MOVING AIR IN SAID INLET OPENING AND OUT SAID EXHAUST OPENING; A FILTER POSITIONED IN SAID CASING FOR FILTERING THE AIR PASSING THERETHROUGH; A HOLLOW INDICATOR TUBE HAVING AN OPEN LOWER END IN COMMUNICATION WITH ATMOSPHERIC AIR OUTSIDE OF SAID CASING AND A CLOSED UPPER END; A HOLLOW CONNECTING TUBE INTEGRALLY FORMED WITH SAID INDICATOR TUBE HAVING ONE OF ITS ENDS IN AIR COMMUNICATION WITH THE UPPER END OF SAID INDICATOR TUBE, THE OTHER END OF SAID CONNECTING TUBE EXTENDING INTO SAID CASING FOR TRANSMITTING THE AIR PRESSURE IN SAID CASING TO THE UPPER END OF SAID INDICATOR TUBE; AND A FLOAT ARRANGED FOR MOVEMENT IN SAID INDICATOR TUBE, SAID FLOAT HAVING AN OBSERVABLE POSITION AT THE UPPER END OF SAID INDICATOR TUBE AND AN OBSERVABLE POSITION AT THE LOWER END OF THE INDICATOR TUBE AND BEING INSTANTANEOUSLY MOVABLE FROM ONE OF SAID POSITIONS TO THE OTHER ONE OF SAID POSITIONS FOR INDICATING THE CONDITION OF THE FILTER.
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |