US3988919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of graphitized carbon beads for gas liquid chromatography
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-10-07
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Granted: 1976-11-02
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Expires: 1995-10-07
Abstract
Abstract Carbonized resin microspheroids are used as a column packing in gas-solid chromatography and as a support in gas-liquid chromatography.
Inventors
- 👤 Yair Talmi
- 👤 Charles B. Pollock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:15
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/28019; B01J20/28054; B01J20/28057; B01J20/281; B01J20/282; B01J20/30; B01J20/3078; B01J20/3092; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
In an apparatus for carrying out gas chromatography comprising a packed column, means for feeding a mixture of gases into said column, and means for detecting the flow of gases out of said column; the improvement comprising carbonized resin microspheroids as the packing material within said column.
Claim 2
Dependent Claim
47 words
In an apparatus for carrying out gas chromatography comprising a packed column, means for feeding a mixture of gases into said column, and means for detecting the flow of gases out of said column; the improvement comprising carbonized resin microspheroids as the packing material within said column.
Claim 3
Dependent Claim
27 words
The improvement according to claim 1 wherein said carbonized resin beads have a specific surface area within the range of 0.20 to 165 square meters per gram.
Claim 4
Dependent Claim
22 words
The improvement according to claim 1 wherein the carbonized resin microspheroids have a diameter within the range of 100 to 600 micrometers.
Claim 5
Dependent Claim
33 words
The improvement according to claim 1 wherein the carbonized resin microspheroids are derived from a precursor resin selected from the group consisting of styrene divinyl-benzene, methacrylic acid, acrylic acid, phenolic and epoxy resins.
Claim 6
Dependent Claim
16 words
The improvement according to claim 1 further including a liquid coating on said carbonized resin microspheroids.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |