US3179587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose crystallite aggregates in chromatographical adsorption
Assignee: FMC Corp
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Filing: 1960-02-19
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Granted: 1965-04-20
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Expires: 1980-02-19
Abstract
No abstract record available.
Inventors
- 👤 Orlando A Battista
- 👤 Jr John J Byrne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:42
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01J; B01J20/00; B01J20/22; B01J20/24; B01J20/281; B01J20/282; B01J20/285; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN A PROCESS FOR CHROMATOGRAPHICALLY SEPARATING A MIXTURE WHEREIN SAID MIXTURE IS INTRODUCED TO AN ADSORBENT AND PASSED THERETHROUGH, THE IMPROVEMENT COMPRISING EMPLOYING CELLULOSE CRYSTALLITE AGGREGATES AS SAID ADSORBENT, SAID AGGREGATES COMPRISING THE ACID-INSOLUBLE CRYSTALLINE RESIDUE OF THE ACID HYDROLYSIS OF CELLULOSE AND BEING CHARACTERIZED BY THE UNIFORMITY F THE LENGTHS OF THE CONSTITUENT CHAINS THEREOF, SAID AGGREGATES HAVING AN AVERAGE LEVEL-OFF D.P. IN THE RANGE OF 15 TO 375 ANHYDROGLUCOSE UNITS, THE CONSTITUENT CHAINS OF EACH AGGREGATE BEING SEPARATE FROM AND FREE OF THOSE IN NEIGHBORING AGGREGATES, SAID AGGREGES BEING FURTHER CHARACTERIZED BY HAVING A SHARP X-RAY DIFFRACTION PATTERN INDICATIVE OF A PARTICULATE, NON-FIBROUS SUBSTANTIALLY CRYSTALLINE STRUCTURE, AND BY HAVING A CHEMICAL PURITY OF AT LEAST 95% AND AN ASH CONTENT OF LESS THAN 100 P.P.M.
Claim 2
Dependent Claim
127 words
IN A PROCESS FOR CHROMATOGRAPHICALLY SEPARATING A MIXTURE WHEREIN SAID MIXTURE IS INTRODUCED TO AN ADSORBENT AND PASSED THERETHROUGH, THE IMPROVEMENT COMPRISING EMPLOYING CELLULOSE CRYSTALLITE AGGREGATES AS SAID ADSORBENT, SAID AGGREGATES COMPRISING THE ACID-INSOLUBLE CRYSTALLINE RESIDUE OF THE ACID HYDROLYSIS OF CELLULOSE AND BEING CHARACTERIZED BY THE UNIFORMITY F THE LENGTHS OF THE CONSTITUENT CHAINS THEREOF, SAID AGGREGATES HAVING AN AVERAGE LEVEL-OFF D.P. IN THE RANGE OF 15 TO 375 ANHYDROGLUCOSE UNITS, THE CONSTITUENT CHAINS OF EACH AGGREGATE BEING SEPARATE FROM AND FREE OF THOSE IN NEIGHBORING AGGREGATES, SAID AGGREGES BEING FURTHER CHARACTERIZED BY HAVING A SHARP X-RAY DIFFRACTION PATTERN INDICATIVE OF A PARTICULATE, NON-FIBROUS SUBSTANTIALLY CRYSTALLINE STRUCTURE, AND BY HAVING A CHEMICAL PURITY OF AT LEAST 95% AND AN ASH CONTENT OF LESS THAN 100 P.P.M.
References Cited (Backward Citations)
US2978446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |