US4063911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature polar stationary liquid phase for gas chromatography
Assignee: Alltech Associates Inc
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Filing: 1976-01-14
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Granted: 1977-12-20
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Expires: 1996-01-14
Abstract
Abstract This invention is an improved stationary phase utilized in gas-liquid chromatography, having high thermal stability, producing low noise level in an electrical detecting apparatus, comprising of a silicone polymer with recurring units of the formula: ##STR1##
Inventors
- 👤 Richard F. Kruppa
- 👤 Arthur Edward Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:12
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/025; C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A column for conducting gas-liquid chromatographic separations, said column exhibiting moderately high polarity in the temperature range of 20° to 275° C and filled with a packing containing a liquid phase having recurring units of the following formula: ##STR4## Where X is a whole number greater than 2.
Claim 2
Dependent Claim
48 words
A column for conducting gas-liquid chromatographic separations, said column exhibiting moderately high polarity in the temperature range of 20° to 275° C and filled with a packing containing a liquid phase having recurring units of the following formula: ##STR4## Where X is a whole number greater than 2.
Claim 3
Dependent Claim
54 words
A column for conducting gas-liquid chromatographic separations, said column exhibiting moderately high polarity in the temperature range of 20° to 275° C and having its inner wall surface covered with a film of a liquid phase consisting of recurring units of the following formula: ##STR5## Where X is a whole number greater than 2.
Claim 4
Dependent Claim
54 words
A column for conducting gas-liquid chromatographic separations, said column exhibiting moderately high polarity in the temperature range of 20° to 275° C and having its inner wall surface covered with a film of a liquid phase consisting of recurring units of the following formula: ##STR5## Where X is a whole number greater than 2.
Claim 5
Dependent Claim
57 words
A column for conducting gas-liquid chromatographic separations, said column exhibiting moderately high polarity in the temperature range of 20° to 275° C and having its inner wall surface covered with a film of packing, said packing containing a liquid phase having recurring units of the following formula: ##STR6## Where X is a whole number greater than 2.
Claim 6
Dependent Claim
57 words
A column for conducting gas-liquid chromatographic separations, said column exhibiting moderately high polarity in the temperature range of 20° to 275° C and having its inner wall surface covered with a film of packing, said packing containing a liquid phase having recurring units of the following formula: ##STR6## Where X is a whole number greater than 2.
Claim 7
Dependent Claim
70 words
In the gas-liquid chromatographic separations of chemical compounds, the method which comprises of passing a mixture of chemical compounds and a carrier gas over an elongated film of a liquid stationary phase which exhibits moderately high polarity and which is maintained in the temperature range of 20° to 275° C and which consists of recurring units of the following formula: ##STR7## Where X is a whole number greater than 2.
Claim 8
Dependent Claim
70 words
In the gas-liquid chromatographic separations of chemical compounds, the method which comprises of passing a mixture of chemical compounds and a carrier gas over an elongated film of a liquid stationary phase which exhibits moderately high polarity and which is maintained in the temperature range of 20° to 275° C and which consists of recurring units of the following formula: ##STR7## Where X is a whole number greater than 2.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |