Patent US4066183A successfully refreshed from Google Patents.
US4066183A
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US
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Chromatographic septum having polyimide coating
Assignee: CHROMATOGRAPHY RESEARCH SUPPLIES Inc A Corp OF
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Filing: 1977-02-24
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Granted: 1978-01-03
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Expires: 1997-02-24
Abstract
Abstract Improved septa for chromatographic apparatus and procedures comprise disc or cylindrical bodies of silicone rubber with a coating of polyimide which may in turn be covered by a coating of Teflon.
Inventors
- 👤 Nelson W. Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:54
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/16; G01N30/18; B; B01; B01D; B01D15/00; B01D15/08; Y; Y10; Y10S; Y10S128/00; Y10S128/14; Y10S138/00; Y10S138/03; Y10S138/07; Y10S215/00; Y10S215/02; Y10S215/03; Y10S215/04; Y10T; Y10T428/00; Y10T428/21; Y10T428/214; Y10T428/215; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31721
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
In a chromatographic septum comprising a body of hypodermic needle penetrable self-healing rubber adapted to serve as a closure for a container or chromatographic system, the improvement which comprises covering the surface of the septum that is to be exposed to the interior of the container or system with a coating of polyimide polymer.
Claim 2
Dependent Claim
54 words
In a chromatographic septum comprising a body of hypodermic needle penetrable self-healing rubber adapted to serve as a closure for a container or chromatographic system, the improvement which comprises covering the surface of the septum that is to be exposed to the interior of the container or system with a coating of polyimide polymer.
Claim 3
Dependent Claim
23 words
The septum of claim 1 wherein the septum is disc-shaped and at least one flat surface thereof is coated with the polyimide polymer.
Claim 4
Dependent Claim
16 words
The septum of claim 1 wherein the coating is itself covered by a coating of tetrafluoroethylene.
Claim 5
Dependent Claim
31 words
The septum of claim 1 wherein the septum is cylinder-shaped and the cylindrical sides as well as at least one end of the septum body is coated by the polyimide polymer.
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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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |