US4539113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluororesin filter
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1984-07-09
•
Granted: 1985-09-03
•
Expires: 2004-07-09
Abstract
Abstract A precision filter made entirely of fluororesin having both a high corrosion and high heat resistance. A plurality of tubular filtering elements are arranged in a fluororesin container. Each tubular filtering element has a polytetraethylene tubular filtering film closed at one end and arranged over or inserted into a fluororesin tubular support. The tubular filtering elements are connected to a cover structure, on the inner surface of which is formed a groove for communicating the tubular filtering elements to one of the liquid inlet and liquid outlet provided in the cover structure.
Inventors
- 👤 Kazuichi Tomita
- 👤 Hiroshi Mano
- 👤 Fumio Matsuyama
- 👤 Akihiko Isomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:43
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D37/00; B01D37/02; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B01D39/1638; B01D39/1653; B01D39/1661; B01D63/00; B01D63/06; B01D63/062; B01D2265/00; B01D2265/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
48 words
A filter comprising: a fluororesin container having a fluid inlet and a fluid outlet; and a tubular filtering element arranged in said fluororesin container, said tubular filtering element comprising a polytetrafluoroethylene tubular filtering film closed at one end and placed over or inserted into a fluororesin tubular support.
Claim 2
Dependent Claim
48 words
A filter comprising: a fluororesin container having a fluid inlet and a fluid outlet; and a tubular filtering element arranged in said fluororesin container, said tubular filtering element comprising a polytetrafluoroethylene tubular filtering film closed at one end and placed over or inserted into a fluororesin tubular support.
Claim 3
Dependent Claim
23 words
The filter as claimed in claim 1, in which said polytetrafluoroethylene tubular filtering film has a pore diameter of 0.01 to 100 microns.
Claim 4
Dependent Claim
28 words
The filter as claimed in claim 1, in which said polytetrafluoroethylene tubular filtering film has a microstructure including fibers and knots coupled through said fibers to one another.
Claim 5
Dependent Claim
30 words
The filter as claimed in claim 1, in which said polytetrafluoroethylene tubular filtering film comprises two kinds of polytetrafluoroethylene porous films of different pore diameters laid one on the other.
Claim 6
Dependent Claim
39 words
The filter as claimed in claim 4, in which one of said two kinds of polytetrafluoroethylene porous films has a pore diameter of 0.01 to 100 microns, and the other has a pore diameter of 0.1 to 500 microns.
Claim 7
Dependent Claim
25 words
The filter as claimed in claim 1, in which said fluoroethylene tubular support comprises a sintered porous tube prepared by molding and sintering polytetrafluoroethylene particles.
Claim 8
Dependent Claim
23 words
The filter as claimed in claim 6, in which said sintered porous tube has a pore diameter of 0.1 microns to 1 mm.
Claim 9
Dependent Claim
63 words
The filter as claimed in claim 1, in which said fluororesin tubular support comprises a laminate including a first layer comprising at least one of a fluororesin net-like mold and unwoven cloth having a larger pore diameter than said filtering film and a second layer comprising a fluororesin porous tube, and said first layer being arranged on the side of said filtering film.
Claim 10
Dependent Claim
18 words
The filter as claimed in claim 1, in which said fluororesin tubular support is closed at one end.
Claim 11
Dependent Claim
25 words
The filter as claimed in claim 1, in which an open end of said polytetrafluoroethylene tubular filtering film is bonded to said fluororesin tubular support.
Claim 12
Dependent Claim
62 words
The filter as claimed in claim 1, in which said fluororesin container has at least one opening in addition to said fluid inlet and said fluid outlet, and further comprising a breather valve, said breather valve being made of a fluororesin porous material for preventing transmission of fluid and permitting transmission of gas, and said breather valve being provided in said opening.
Claim 13
Dependent Claim
33 words
The filter as claimed in claim 11, in which said fluororesin porous material is a polytetrafluoroethylene porous material having a microstructure which includes fibers and knots coupled through said fibers to one another.
Claim 14
Dependent Claim
18 words
The filter as claimed in claim 11, in which said fluororesin porous material comprises a polytetrafluoroethylene unwoven cloth.
Claim 15
Dependent Claim
22 words
The filter as claimed in claim 11, in which said breather valve is provided on a liquid inlet side of said container.
Claim 16
Dependent Claim
102 words
A filter comprising: a fluororesin container; a plurality of tubular filtering elements, each of said tubular filtering elements comprising a polytetrafluoroethylene tubular filtering film closed at one end placed over or inserted into a fluororesin tubular support; and a cover structure for tightly closing said container, said cover structure having a liquid inlet and a liquid outlet, said tubular filtering elements being connected to said cover structure, and a communicating groove being formed in said cover structure for communicating said tubular filtering elements to one of said liquid inlet and liquid outlet, said communicating groove being in the form of an arc.
Claim 17
Dependent Claim
102 words
A filter comprising: a fluororesin container; a plurality of tubular filtering elements, each of said tubular filtering elements comprising a polytetrafluoroethylene tubular filtering film closed at one end placed over or inserted into a fluororesin tubular support; and a cover structure for tightly closing said container, said cover structure having a liquid inlet and a liquid outlet, said tubular filtering elements being connected to said cover structure, and a communicating groove being formed in said cover structure for communicating said tubular filtering elements to one of said liquid inlet and liquid outlet, said communicating groove being in the form of an arc.
Claim 18
Dependent Claim
64 words
The filter as claimed in claim 15, in which said cover structure comprises a supporting board to which said tubular filtering elements are connected and which tightly closes said cover to said container, and a fixing board sealed to said container and located outside of said supporting board, said communicating groove being formed in a surface of said fixing board adjacent said supporting board.
References Cited (Backward Citations)
US3503516A
Cited
US3843570A
Cited
GB1357201A
Cited
US3977967A
Cited
US3950255A
Cited
US4248924A
Cited
US4456061A
Cited
US4461707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |