US3557531A
Expired / Lapsed
US
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Gas-liquid chromatography method
Assignee: WR Grace and Co
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Filing: 1969-06-05
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Granted: 1971-01-26
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Expires: 1989-06-05
Abstract
Abstract The invention relates to a gas-liquid chromatography system utilizing, as the packing material, a coated synthetic molecular sieve having a pore diameter of less than 13 angstrom units. The packing is particularly useful with aqueous samples as the packing removes the water peak from the chromatogram.
Inventors
- 👤 Robert W Mckinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:47
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28078; B01J20/281; B01J20/282; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3268; B01J20/3272; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A separation process which comprises passing a gaseous test sample containing water and complex organic compounds through a gas-liquid chromatography column packed with a packing composition characterized with means for eliminating water peaks from chromatographs, said means consisting of a substantially uniform coating of a liquid phase adsorbed on synthetic molecular sieve packing having a pore diameter of less than 13 angstrom units and a sieve particle size of from about 40 to about 150 mesh; generating signals for components forming the test sample absent a signal for water; and recording the generated signals as peaks on a chromatograph.
Claim 2
Dependent Claim
99 words
A separation process which comprises passing a gaseous test sample containing water and complex organic compounds through a gas-liquid chromatography column packed with a packing composition characterized with means for eliminating water peaks from chromatographs, said means consisting of a substantially uniform coating of a liquid phase adsorbed on synthetic molecular sieve packing having a pore diameter of less than 13 angstrom units and a sieve particle size of from about 40 to about 150 mesh; generating signals for components forming the test sample absent a signal for water; and recording the generated signals as peaks on a chromatograph.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |