US3759393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid treating filter
Assignee: American Air Filter Co Inc
•
Filing: 1971-08-05
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Granted: 1973-09-18
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Expires: 1991-08-05
Abstract
Abstract An improved air filter including an expanded filamentous mat and a support frame in communication therewith extending along the perimeter of the mat, the expanded filamentous mat including a plurality of thickness wherein the filament density varies from thickness to thickness.
Inventors
- 👤 J Tate
- 👤 H Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:55
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D39/00; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024; B01D2275/00; B01D2275/10; B01D2279/00; B01D2279/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A fluid treating filter comprising an expanded filamentous mat and a support frame in communicative relation therewith; said mat having first and second filament layers, the filaments of the layers being bonded by a binder, and the concentration of said filaments in said layers being different, said support frame being superposed the layer having the lower concentration of filaments and bonded to the layer having the higher concentration of filaments with the layer having the lower concentration of filaments being disposed therebetween and bonded to said support frame, the support frame extending only adjacently along the peripheral edge of said mat.
Claim 2
Dependent Claim
101 words
A fluid treating filter comprising an expanded filamentous mat and a support frame in communicative relation therewith; said mat having first and second filament layers, the filaments of the layers being bonded by a binder, and the concentration of said filaments in said layers being different, said support frame being superposed the layer having the lower concentration of filaments and bonded to the layer having the higher concentration of filaments with the layer having the lower concentration of filaments being disposed therebetween and bonded to said support frame, the support frame extending only adjacently along the peripheral edge of said mat.
Claim 3
Dependent Claim
25 words
The fluid treating filter of claim 1 wherein the binder in the first portion and the binder in the second portion are of different viscosities.
Claim 4
Dependent Claim
14 words
The fluid treating filter of claim 1 wherein the mat is of unitary construction.
Claim 5
Dependent Claim
26 words
The fluid treating filter of claim 1 wherein the concentration of filaments in one of said portions is sufficient to support said filter in operating position.
References Cited (Backward Citations)
US2138874A
Cited
GB1105306A
Cited
GB1097917A
Cited
US3388536A
Cited
US3526557A
Cited
US3460321A
Cited
US3690852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |