US4018678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for fluid filtration and the like with the aid of chitosan
Assignee: KYPRO Inc A CORP OF
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Filing: 1974-08-09
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Granted: 1977-04-19
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Expires: 1994-08-09
Abstract
Abstract This disclosure is concerned with the use of chitosan as a coating or packing in fluid filtration and other systems to provide a high ratio of surface-to-volume of reactive material that exposes a maximum number of reactive amino groups for rapid reaction with fluid media passed therethrough.
Inventors
- 👤 Quintin P. Peniston
- 👤 Edwin Lee Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; B; B01; B01D; B01D53/00; B01D53/34
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
44 words
A method of fluid-flow filtration that comprises providing a filtration bed having chitosan disposed throughout the bed with a high ratio surface-to-volume of exposed reactive amino groups of the chitosan, and passing fluid containing constituents reactive with said amino groups through the filtration bed.
Claim 2
Independent Claim
44 words
A method of fluid-flow filtration that comprises providing a filtration bed having chitosan disposed throughout the bed with a high ratio surface-to-volume of exposed reactive amino groups of the chitosan, and passing fluid containing constituents reactive with said amino groups through the filtration bed.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 and in which the providing step comprises providing bed particles and coating the bed particles with chitosan.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1 and in which the providing step comprises packing chitosan particles within the bed.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 3 in which particles of the order of 30-40 mesh per inch in size are packed within the bed.
Claim 6
Dependent Claim
20 words
A method as claimed in claim 1 and in which the providing step comprises packing chitosan fibers along the bed.
Claim 7
Dependent Claim
26 words
A method as claimed in claim 5 in which fibers of the order of 150 microns in average diameter or less are packed along the bed.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1 and in which said fluid is cigarette smoke and said constituents comprises pyrolysis products of cigarette materials.
Claim 9
Dependent Claim
47 words
A method as claimed in claim 1, and in which the providing step comprises applying a solution of chitosan to members selected from the group consisting of inert particles, beads, spheres, fibers and surfaces, drying the resulting chitosan-coated members, and packing said members into said filtration bed.
Claim 10
Dependent Claim
22 words
A method as claimed in claim 8 and in which the chitosan applied is of the order of a four percent solution.
Claim 11
Dependent Claim
24 words
A method as claimed in claim 1 and in which the providing step comprises coating chitosan upon substrate filter members of the filtration bed.
Claim 12
Dependent Claim
25 words
A method as claimed in claim 10 and in which the chitosan is coated upon filter members of the order of a millimeter in size.
Claim 13
Independent Claim
55 words
A method of removing from cigarette smoke constituents comprising pyrolysis products, acrolein, formic and acetic acids, acetaldehyde, phenols and negatively charged particles, that comprises providing a filtration region having chitosan disposed throughout the region with a high ratio surface-to-volume of exposed reactive amino groups of the chitosan, and passing the smoke through the filtration region.
Claim 14
Independent Claim
55 words
A method of removing from cigarette smoke constituents comprising pyrolysis products, acrolein, formic and acetic acids, acetaldehyde, phenols and negatively charged particles, that comprises providing a filtration region having chitosan disposed throughout the region with a high ratio surface-to-volume of exposed reactive amino groups of the chitosan, and passing the smoke through the filtration region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |