Patent US3263403A successfully refreshed from Google Patents.
US3263403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter condition indicator
Assignee: General Electric Co
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Filing: 1964-09-17
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Granted: 1966-08-02
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Expires: 1984-09-17
Abstract
No abstract record available.
Inventors
- 👤 William T Ladusaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:17
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0084; B01D46/0086; B01D46/42; B01D46/44; B01D46/446; F; F24; F24F; F24F8/00; F24F8/10; B01D2273/00; B01D2273/30; B01D2279/00; B01D2279/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
AN AIR CONDITIONING UNIT COMPRISING: A MULTIPLE-SPEED FAN OPERABLE AT EITHER A LOW SPEED OR A HIGH SPEED FOR MOVING A STREAM OF AIR THROUGH SAID UNIT AT EITHER A LOW VELOCITY OR A HIGH VELOCITY, FAN CONTROL MEANS MOVABLE TO A FIRST SETTING TO OPERATE SAID FAN AT A LOW SPEED AND TO A SECOND SETTING TO OPERATE SAID FAN AT A HIGH SPEED, A FILTER POSITIONED IN SAID UNIT FOR FILTERING SAID STREAM OF AIR, SAID FILTER OFFERING A GREATER RESISTANCE TO THE FLOW OF AIR THERETHROUGH AT A HIGH FAN SPEED THAN AT A LOW FAN SPEED, FILTER CONDITION INDICATING MEANS RESPONSIVE TO THE PRESSURE DROP ACROSS SAID FILTER FOR INDICATING WHEN SAID FILTER IS DIRTY, SAID INDICATING MEANS INCLUDING AN INDICATOR MOVABLE, WHEN SAID FILTER IS DIRTY, TO A FIRST POSITION AT LOW FAN SPEED AND TO A SECOND POSITION AT HIGH FAN SPEED, AND MEANS FOR INDICATING SAID FIRST POSITION WHEN SAID FAN CONTROL MEANS IS AT ITS FIRST SETTING AND SAID SECOND POSITION WHEN SAID FAN CONTROL MEANS IS AT ITS SECOND SETTING.
Claim 2
Dependent Claim
179 words
AN AIR CONDITIONING UNIT COMPRISING: A MULTIPLE-SPEED FAN OPERABLE AT EITHER A LOW SPEED OR A HIGH SPEED FOR MOVING A STREAM OF AIR THROUGH SAID UNIT AT EITHER A LOW VELOCITY OR A HIGH VELOCITY, FAN CONTROL MEANS MOVABLE TO A FIRST SETTING TO OPERATE SAID FAN AT A LOW SPEED AND TO A SECOND SETTING TO OPERATE SAID FAN AT A HIGH SPEED, A FILTER POSITIONED IN SAID UNIT FOR FILTERING SAID STREAM OF AIR, SAID FILTER OFFERING A GREATER RESISTANCE TO THE FLOW OF AIR THERETHROUGH AT A HIGH FAN SPEED THAN AT A LOW FAN SPEED, FILTER CONDITION INDICATING MEANS RESPONSIVE TO THE PRESSURE DROP ACROSS SAID FILTER FOR INDICATING WHEN SAID FILTER IS DIRTY, SAID INDICATING MEANS INCLUDING AN INDICATOR MOVABLE, WHEN SAID FILTER IS DIRTY, TO A FIRST POSITION AT LOW FAN SPEED AND TO A SECOND POSITION AT HIGH FAN SPEED, AND MEANS FOR INDICATING SAID FIRST POSITION WHEN SAID FAN CONTROL MEANS IS AT ITS FIRST SETTING AND SAID SECOND POSITION WHEN SAID FAN CONTROL MEANS IS AT ITS SECOND SETTING.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |