US4861353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element and assembly
Assignee: EIDP Inc
•
Filing: 1987-12-07
•
Granted: 1989-08-29
•
Expires: 2007-12-07
Abstract
Abstract A tubular textile of filamentary poly (tetrafluoroethylene) useful to prolong the mechanical life of a filter material. An assembly for filtering comprising a cage, the tubular filamentary PTFE, and a superjacent filter.
Inventors
- 👤 Kurt H. Wyss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D46/00; B01D46/02; B01D46/06; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/12; B01D2239/1233; B01D2239/1258; B01D2239/1291; B01D2273/00; B01D2273/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
In a process of filtering a gas containing particulate matter using an outside bag filtration system, in which the bag is flexed and particulate matter removed from the outside surface of the bag by pulses of gas released inside the bag, the improvement comprising the steps of covering the cage of the outside bag filtration system with a tubular textile of poly(tetrafluoroethylene) having an air permeability of at least 1000 ft 3 per ft 2 per minute at a pressure of 1/2 inch of water said tubular textile conforming to the outer dimension of the cage, and then applying the filter bag in the standard manner.
Claim 2
Dependent Claim
106 words
In a process of filtering a gas containing particulate matter using an outside bag filtration system, in which the bag is flexed and particulate matter removed from the outside surface of the bag by pulses of gas released inside the bag, the improvement comprising the steps of covering the cage of the outside bag filtration system with a tubular textile of poly(tetrafluoroethylene) having an air permeability of at least 1000 ft 3 per ft 2 per minute at a pressure of 1/2 inch of water said tubular textile conforming to the outer dimension of the cage, and then applying the filter bag in the standard manner.
Claim 3
Dependent Claim
68 words
An assembly for filtering hot gases containing particulate matter comprising a cage covered with a tubular textile of poly(tetrafluoroethylene) having an air permeability of greater than 1000 ft 3 per ft 2 per minute at a pressure of 1/2 inch of water said tubular textile conforming to the outer dimension of the cage, and superjacent to said tubular textile layer a filtration layer of conventional design and construction.
Claim 4
Dependent Claim
68 words
An assembly for filtering hot gases containing particulate matter comprising a cage covered with a tubular textile of poly(tetrafluoroethylene) having an air permeability of greater than 1000 ft 3 per ft 2 per minute at a pressure of 1/2 inch of water said tubular textile conforming to the outer dimension of the cage, and superjacent to said tubular textile layer a filtration layer of conventional design and construction.
Claim 5
Dependent Claim
33 words
A tubular textile composed of filamentary poly(tetrafluoroethylene) said tubular textile having an air permeability of greater than 1000 ft 3 per ft 2 per minute at a pressure of 1/2 inch of water.
Claim 6
Dependent Claim
33 words
A tubular textile composed of filamentary poly(tetrafluoroethylene) said tubular textile having an air permeability of greater than 1000 ft 3 per ft 2 per minute at a pressure of 1/2 inch of water.
Claim 7
Dependent Claim
21 words
The tubular textile of claim 3 having a weight in the range of 2 to 6 oz per yd 2 .
Claim 8
Dependent Claim
23 words
The tubular textile of claim 3 in which the poly(tetrafluoroethylene) of the textile is present as monofilaments having deniers of at least 100.
Claim 9
Dependent Claim
31 words
The tubular textile of claim 3 in which the poly(tetrafluoroethylene) of the textile is present as a multifilament yarn, and the filaments of the yarn have deniers of less than 100.
References Cited (Backward Citations)
US2910763A
Cited
US2933154A
Cited
US3957938A
Cited
US3937621A
Cited
US3986851A
Cited
US4070519A
Cited
US4100323A
Cited
US4025679A
Cited
US4257791A
Cited
US4270935A
Cited
DE2826510A1
Cited
US4231770A
Cited
US4280826A
Cited
US4297115A
Cited
US4324574A
Cited
US4361619A
Cited
US4588464A
Cited
US4689059A
Cited
GB2157586A
Cited
US4536439A
Cited
US4612237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |