US3201926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filtering blanket for an air filtering system
Assignee: Industrial Air Filters Ltd
•
Filing: 1962-07-12
•
Granted: 1965-08-24
•
Expires: 1982-07-12
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:35
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D39/086; B01D39/14; B01D46/00; B01D46/0027; B01D46/0035; B01D46/10; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/0492; B01D2239/06; B01D2239/0604; B01D2239/064; B01D2239/065; B01D2275/00; B01D2275/10; B01D2279/00; B01D2279/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN AN AIR FILTER FOR AN AIR CONDITIONING SYSTEM, A SUBSTANTIALLY NON-BLOCKING AIR FILTERING FIBROUS BLANKET OF SUBSTANTIAL THICKNESS COMPRISING (A) AN UPSTREAM FILTERING LAYER OF NON-TACKY FIBERS HAVING A THICKNESS OF ABOUT 50% TO 25% OF THE TOTAL THICKNESS OF THE BLANKET AND PRESENTING TO THE AIR TRAVELING THERETHROUGH NON-TACKY SURFACES WHEREBY LARGE AIRBORNE PARTICLES ARE FIRST REMOVED FROM THE SAID AIR AND SEPARATED FROM THE SMALL AIRBORNE PARTICLES; (B) A DOWNSTREAM FILTERING LAYER HAVING THE FIBERS THEREOF IMPREGNATED WITH A NON-MIGRATORY, WATERINSOLUBLE POLYMERIZED HYDROCARBON SELECTED FROM THE GROUP OF POLYMERS CONSISTING OF POLYBUTENE HAVING A MOLECULAR WEIGHT BETWEEN 1000 AND 2500, SAID HYDROCARBON CHARACTERIZED BY PERMANENT TACKINESS AND NEGLIGIBLE VAPOR PRESSURE WHEREBY SUBSTANTIALLY ALL THE REMAINING AIRBORNE PARTICLES ARE REMOVED FROM THE AIR.
Claim 2
Dependent Claim
125 words
IN AN AIR FILTER FOR AN AIR CONDITIONING SYSTEM, A SUBSTANTIALLY NON-BLOCKING AIR FILTERING FIBROUS BLANKET OF SUBSTANTIAL THICKNESS COMPRISING (A) AN UPSTREAM FILTERING LAYER OF NON-TACKY FIBERS HAVING A THICKNESS OF ABOUT 50% TO 25% OF THE TOTAL THICKNESS OF THE BLANKET AND PRESENTING TO THE AIR TRAVELING THERETHROUGH NON-TACKY SURFACES WHEREBY LARGE AIRBORNE PARTICLES ARE FIRST REMOVED FROM THE SAID AIR AND SEPARATED FROM THE SMALL AIRBORNE PARTICLES; (B) A DOWNSTREAM FILTERING LAYER HAVING THE FIBERS THEREOF IMPREGNATED WITH A NON-MIGRATORY, WATERINSOLUBLE POLYMERIZED HYDROCARBON SELECTED FROM THE GROUP OF POLYMERS CONSISTING OF POLYBUTENE HAVING A MOLECULAR WEIGHT BETWEEN 1000 AND 2500, SAID HYDROCARBON CHARACTERIZED BY PERMANENT TACKINESS AND NEGLIGIBLE VAPOR PRESSURE WHEREBY SUBSTANTIALLY ALL THE REMAINING AIRBORNE PARTICLES ARE REMOVED FROM THE AIR.
References Cited (Backward Citations)
GB745775A
Cited
US2061570A
Cited
US2019241A
Cited
US2078197A
Cited
GB482543A
Cited
US2579084A
Cited
US2751040A
Cited
US2762775A
Cited
US2835341A
Cited
US2888095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |