US3416993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of cellulose ethers in preparative layer chromatography
Assignee: Merck KGaA
•
Filing: 1965-10-11
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Granted: 1968-12-17
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Expires: 1985-10-11
Abstract
No abstract record available.
Inventors
- 👤 Heusser Dietrich
- 👤 Halpaap Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:11
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/286; B01J20/02; B01J20/06; B01J20/30; B01J20/3042; B01J20/32; B01J20/3202; B01J20/3204; B01J2220/00; B01J2220/40; B01J2220/49; B01J2220/50; B01J2220/54; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/26; Y10T428/263
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
AN ADSORBENT COMPOSITION FOR LAYER CHROMATOGRAPHY COMPRISING AN INTIMATE MIXTURE OF, IN PERCENT BY WEIGHT, 0.005-1% OF A WATER SOLUBLE OR WATER SWELLABLE CELLULOSE ETHER AND SUBSTANTIALLY THE REMAINDER OF SIAD COMPOSITION BEING A CHROATOGRAPHY ADSORBENT SELECTED FROM THE GROUP CONSISTING OF SILICA GEL, KIESELGUHR, AND MAGNESIUM SILICATE, ALUMINUM OXIDE, AND CELLULOSE.
Claim 2
Dependent Claim
52 words
AN ADSORBENT COMPOSITION FOR LAYER CHROMATOGRAPHY COMPRISING AN INTIMATE MIXTURE OF, IN PERCENT BY WEIGHT, 0.005-1% OF A WATER SOLUBLE OR WATER SWELLABLE CELLULOSE ETHER AND SUBSTANTIALLY THE REMAINDER OF SIAD COMPOSITION BEING A CHROATOGRAPHY ADSORBENT SELECTED FROM THE GROUP CONSISTING OF SILICA GEL, KIESELGUHR, AND MAGNESIUM SILICATE, ALUMINUM OXIDE, AND CELLULOSE.
Claim 3
Dependent Claim
21 words
A COMPOSITION AS DEFINED BY CLAIM 1 WHEREIN THE CELLULOSE ETHER IS METHYLCELLUSLOSE, METHYLHYDROXYETHYLCELLULOSE, EMTHYLETHYLCELLULOSE, ETHYLHYDROXYETHYLCELLULOSE, SODIUM CARBOXYMETHYLHYDROXYETHYLCELLULOSE OR SODIUM CARBOXYMETHYLCELLULOSE.
Claim 4
Dependent Claim
29 words
A CHROMATOGRAPHIC PLATE COMPRISING A SUPPORT PLATE AND SUPERIMPOSED THEREON A UNIFORM LAYER OF ABOUT UP TO 3 MM. IN THICKNESS OF A COMPOSITION AS DEFINED BY CLAIM 3.
References Cited (Backward Citations)
US3303043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |