US4513607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analytical filtration technique
Assignee: Individual
•
Filing: 1981-10-20
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Granted: 1985-04-30
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Expires: 2001-10-20
Abstract
Abstract A procedure for accurately determining size distribution of macroaggregate and colloidal particles in a solution wherein the solution is passed through a first capillary filter of selected pore diameter and then through a tortuous path provided by a fibrous filter composed of fibers having affinity for the colloidal substance.
Inventors
- 👤 John Coupal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:15
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/02; G01N15/0272
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A procedure for classifying macroaggregate and colloidal particles in a liquid dispersion by size wherein the dispersion is passed through a first capillary filter of selected pore diameter to retain particles and then through a tortuous path provided by a fibrous filter composed of fibers having affinity for the colloidal substance for removal of a portion of the colloidal particles and the balance of the particles are retained in the liquid passing through the first filter and the fibrous filler.
Claim 2
Dependent Claim
80 words
A procedure for classifying macroaggregate and colloidal particles in a liquid dispersion by size wherein the dispersion is passed through a first capillary filter of selected pore diameter to retain particles and then through a tortuous path provided by a fibrous filter composed of fibers having affinity for the colloidal substance for removal of a portion of the colloidal particles and the balance of the particles are retained in the liquid passing through the first filter and the fibrous filler.
Claim 3
Dependent Claim
16 words
The invention of claim 1 wherein said dispersion includes colloidal technetium particles of random size distribution.
Claim 4
Dependent Claim
14 words
The invention of claim 1 wherein said fibrous filter includes fibers of cellulose esters.
Claim 5
Dependent Claim
16 words
The invention of claim 3 wherein said first capillary filter is a filter membrane of polycarbonate.
Claim 6
Dependent Claim
13 words
The invention of claim 4 wherein said colloidal dispersion includes radioactive sulfur compounds.
Claim 7
Dependent Claim
14 words
The invention of claim 4 wherein said colloidal dispersion includes radioactive antimony sulfide compounds.
Claim 8
Dependent Claim
13 words
The invention of claim 4 wherein said colloidal dispersion includes radioactive stannous compounds.
Claim 9
Dependent Claim
61 words
The invention of claim 1 wherein said dispersion includes albumin macroaggregate of random size distribution and wherein said procedure includes passing the portion of said dispersion through a second capillary filter having capillaries of larger diameter than of said first filter prior to passage of said solution through said first filter, for removal of particles of said albumin having selected diameter.
Claim 10
Dependent Claim
54 words
The invention of claim 1 wherein said dispersion is diluted with sodium chloride solution in a syringe, admitting a selected quantity of air to said syringe, and passing said dispersion through said first filter and fibrous filter followed by the air from said syringe and collecting the material emitted from the fibrous filter filtrate.
Claim 11
Dependent Claim
20 words
The invention of claim 9 including measuring the radioactivity of the material on the first filter, fibrous filter and filtrate.
References Cited (Backward Citations)
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Cited
US4042677A
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US4057617A
Cited
US4075314A
Cited
US4066742A
Cited
US4094965A
Cited
US4401566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |