US3664967A
Expired / Lapsed
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Pellicular column packing for liquid chromatography
Assignee: Dow Chemical Co
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Filing: 1970-02-11
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Granted: 1972-05-23
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Expires: 1990-02-11
Abstract
Abstract A halogenated organo silica gel or halogenated organo alumina prepared by reacting an organo halosilane with a silica gel or alumina gel of high relative surface area, then reacting the soproduced product with a halogen.
Inventors
- 👤 Rudolph H Stehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:18
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/291; B01J20/02; B01J20/10; B01J20/103; B01J20/286; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3244; C; C01; C01B; C01B33/00; C01B33/113; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
12 words
The packing of claim 1 wherein said solid is a silica gel.
Claim 2
Dependent Claim
30 words
hydrolyzing the product of step 1 if the organo moiety is vinyl and further reacting this product with an alkyl halide, sulfide or thiocyanate having 8 to 28 carbon atoms,
Claim 3
Dependent Claim
34 words
the resulting product of step 2 or the long chain product of step 1 with a halogen to provide from 0.01 to about 5 percent by weight halogen based on total weight of product.
Claim 4
Dependent Claim
24 words
The packing of claim 2 wherein the product before halogenation has been further reacted with an alcohol having from 6 to 28 carbon atoms.
Claim 5
Dependent Claim
11 words
The packing of claim 1 wherein the alcohol is octyl alcohol.
Claim 6
Dependent Claim
11 words
The packing of claim 1 wherein the solid is an alumina.
Claim 7
Dependent Claim
15 words
A method for preparing the chromatographic packing of claim 1 which consists essentially of: reacting
Claim 8
Dependent Claim
34 words
The process of claim 6 wherein said organo moiety is octadecyl, said halogen is bromine and an alcohol of from 6 to 28 carbon atoms is reacted with said organo silica prior to halogenation.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |