Patent US3869375A successfully refreshed from Google Patents.
US3869375A
Expired / Lapsed
US
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Gasket structure
Assignee: Asahi Kasei Corp
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Filing: 1971-12-23
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Granted: 1975-03-04
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Expires: 1991-12-23
Abstract
Abstract A gasket structure for multi-section electrolytic cells and electric dializers, which is capable of preventing the leakage of the electrolyte by a combination of a resilient soft material and a hard material and preventing deformation of guide passages adjacent liquid inlet and outlet openings.
Inventors
- 👤 Hiroshi Ono
- 👤 Mitsuo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:51
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/50; B01D2313/00; B01D2313/04; B01D2313/041
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
A gasket structure for preventing leaks, said gasket structure comprising at least three gasket substructures, at least two of said substructures each including a first sheet of hard material and a second sheet of soft material wherein said sheet of soft material is thinner than said sheet of hard material and wherein said first and second sheets have a central opening and guide passages formed therein; said at least two gasket substructures being held together by pressure sufficient to compress said soft sheets without substantially compressing said hard sheets whereby leaks are prevented and said central opening and guide passages are not deformed and said third gasket substructure includes a sheet of soft resilient material and guide wall members of hard, resilient material said third gasket substructure having a central opening and guide passages corresponding to said central opening and guide passages formed by said at least two gasket substructures wherein said guide wall members are positioned within the central opening of said soft sheet and at least one of the guide passages of said third gasket substructures commuincates with said central opening.
Claim 2
Dependent Claim
183 words
A gasket structure for preventing leaks, said gasket structure comprising at least three gasket substructures, at least two of said substructures each including a first sheet of hard material and a second sheet of soft material wherein said sheet of soft material is thinner than said sheet of hard material and wherein said first and second sheets have a central opening and guide passages formed therein; said at least two gasket substructures being held together by pressure sufficient to compress said soft sheets without substantially compressing said hard sheets whereby leaks are prevented and said central opening and guide passages are not deformed and said third gasket substructure includes a sheet of soft resilient material and guide wall members of hard, resilient material said third gasket substructure having a central opening and guide passages corresponding to said central opening and guide passages formed by said at least two gasket substructures wherein said guide wall members are positioned within the central opening of said soft sheet and at least one of the guide passages of said third gasket substructures commuincates with said central opening.
Claim 3
Dependent Claim
19 words
The gasket of claim 1 wherein said third gasket substructure is sandwiched between said at least two gasket substructures.
Claim 4
Dependent Claim
30 words
The gasket structure of claim 2 wherein each of said at least two gasket substructures are inverted with respect to the succeeding and/or preceeding said at least two gasket substructures.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |