Patent US3757490A successfully refreshed from Google Patents.
US3757490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic adsorbents
Assignee: Individual
•
Filing: 1971-06-07
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Granted: 1973-09-11
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Expires: 1991-06-07
Abstract
Abstract Improved chromatographic separations are achieved with solidliquid chromatography by employing particles of a specified particle size distribution, whereby the large to small size particle weight ratio is defined as having 70 to 90 parts of coarse particles, wherein at least 90 weight percent of the particles have diameters within 10 percent of the average diameter, and 10 to 30 parts of fine particles, the average diameter being 10 to 20 percent of the average diameter of the coarse particles, and having at least 50 weight percent of the particles within 50 percent of the average diameter of the fine particles.
Inventors
- 👤 Ja Ma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:12
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/282; B01J20/283; B01J20/02; B01J20/06; B01J20/08; B01J20/10; B01J20/103; B01J20/16; B01J20/18; B01J20/28; B01J20/28002; B01J20/28004; B01J20/284; B01J20/291; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
16 words
A mixture according to claim 1, wherein said particles are composed of the adsorbent silica gel.
Claim 2
Dependent Claim
43 words
A mixture according to claim 2, having from 80 to 90 parts of said coarse particles and from 20 to 10 parts respectively of said fine particles, the average diameter for said fine particles being 12 to 18 percent of said coarser particles.
Claim 3
Dependent Claim
15 words
A mixture according to claim 1, wherein said particles are composed of the adsorbent alumina.
Claim 4
Dependent Claim
43 words
A mixture according to claim 4, having from 80 to 90 parts of said coarse particles and from 20 to 10 parts respectively of said fine particles, the average diameter for said fine particles being 12 to 18 percent of said coarser particles.
Claim 5
Dependent Claim
40 words
A mixture according to claim 1, having more than 2 different sized particles, wherein the relationship of each sized particles to the next larger sized particles is the same as the relationship of said coarse particles to said fine particles.
Claim 6
Dependent Claim
12 words
A mixture according to claim 1, wherein said particles are molecular sieves.
Claim 7
Dependent Claim
15 words
A mixture according to claim 1, wherein said particles are gas phase chromatograph support packing.
Claim 8
Dependent Claim
12 words
A mixture according to claim 1, wherein said particles are ion-exchange resin.
Claim 9
Dependent Claim
111 words
In a method for resolving a mixture of materials by introducing said mixture in a fluid state onto a chromatographic column or chromatoplate composed of a packing of particles of various dimensions, the improvement which comprises employing particles having a size distribution wherein 70 to 90 parts are coarse particles having at least 90 weight percent of the particles having diameters within 10 percent of the average diameter, and 30 to 10 parts are fine particles having an average diameter in the range of from 10 to 20 percent of the coarser particles, at least 50 weight percent of said fine particles having diameters within 50 percent of the average diameter.
Claim 10
Dependent Claim
38 words
A method according to claim 10, having additional coarser particles, wherein the relationship of each sized particles to the next smaller sized particles is substantially the same as the relationship of the medium particles to the fine particles.
Claim 11
Dependent Claim
12 words
A method according to claim 10, wherein said adsorbent is silica gel.
Claim 12
Dependent Claim
11 words
A method according to claim 10, wherein said adsorbent is alumina.
Claim 13
Dependent Claim
12 words
A method according to claim 10, wherein said particles are molecular sieves.
Claim 14
Dependent Claim
14 words
A method according to claim 10, wherein said particles are gas phase chromatographic supporter.
Claim 15
Dependent Claim
13 words
A method according to claim 10, wherein said particles are ion exchange resins.
Claim 16
Dependent Claim
15 words
A method according to claim 10, wherein said resolution zone is a thick layer chromatography.
Claim 17
Dependent Claim
14 words
A method according to claim 10, wherein said resolution zone is a column chromatography.
Claim 18
Dependent Claim
14 words
A method according to claim 10, wherein said resolution is a gas phase chromatography.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |