US4755293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density filler type filtration equipment
Assignee: Tosoh Corp
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Filing: 1987-07-27
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Granted: 1988-07-05
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Expires: 2007-07-27
Abstract
Abstract An elongate cylindrical column body has a flange at an open end and an annular extension extending beyond the flange in a direction of the length of the column body. The cover has a seal ring fitted therein for supporting a partition member. The seal ring is sized and shaped so that when the cover is placed on the open end of the column body, the seal ring and a guide face defined by the annular extension sealingly overlap one another by a predetermined length. Bolts passing through the flanges of the column body and cover are used to lock the cover onto the column body.
Inventors
- 👤 Kiyoaki Sakamoto
- 👤 Yasuhiro Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:42
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/56; G01N2030/022; G01N2030/027; G01N2030/562; G01N30/60; G01N30/6004
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
High density filler type filtration equipment for liquid chromatography comprising: an elongate cylindrical chromatography column body having at least an upper open end, flange means adjacent said open end and an annular extension extending beyond said flange means in a direction of the length of said column body; a cover having a fluid path; a partition membrane; means for mounting said partition membrane to said cover; a seal ring mounted to said cover and comprising means for sealing said open end of said column body when said cover is placed on said open end, wherein said annular extension and said seal ring overlap one another by a predetermined length when said cover is placed on said open end and wherein said annular extension and said seal ring are sized such that said annular extension defines a guide face along which said seal ring sealingly slides as said cover is placed on said open end, and means for locking said cover on said open end.
Claim 2
Dependent Claim
164 words
High density filler type filtration equipment for liquid chromatography comprising: an elongate cylindrical chromatography column body having at least an upper open end, flange means adjacent said open end and an annular extension extending beyond said flange means in a direction of the length of said column body; a cover having a fluid path; a partition membrane; means for mounting said partition membrane to said cover; a seal ring mounted to said cover and comprising means for sealing said open end of said column body when said cover is placed on said open end, wherein said annular extension and said seal ring overlap one another by a predetermined length when said cover is placed on said open end and wherein said annular extension and said seal ring are sized such that said annular extension defines a guide face along which said seal ring sealingly slides as said cover is placed on said open end, and means for locking said cover on said open end.
Claim 3
Dependent Claim
17 words
The equipment of claim 1, wherein said seal ring comprises said means for mounting said partition membrane.
Claim 4
Dependent Claim
31 words
The equipment of claim 2, wherein said cover includes an annular flange having an inner periphery with a circumferential groove and wherein said seal ring is fitted in said circumferential groove.
Claim 5
Dependent Claim
46 words
The equipment of claim 3, including a further circumferential groove in said column body and surrounding said exterior, wherein said seal ring fits in said further circumferential groove when said cover is placed on said open end with said extension and seal ring overlapping one another.
Claim 6
Dependent Claim
45 words
The equipment of claim 1, wherein said cover includes an annular flange having an inner periphery with a circumferential groove, further including a stopper member separate from said seal ring fitted in said groove, said stopper member comprising said means for mounting said partition membrane.
Claim 7
Dependent Claim
16 words
The equipment of claim 1, wherein said partition membrane comprises a multi-hole stainless steel sintered plate.
Claim 8
Dependent Claim
18 words
The equipment of claim 1, wherein said extension has a length of between 5 mm and 20 mm.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |