Patent US3638709A successfully refreshed from Google Patents.
US3638709A
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Method of suspending immobilized biological specimens in a transparent gel in a transparent container
Assignee: Dow Chemical Co
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Filing: 1969-12-11
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Granted: 1972-02-01
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Expires: 1989-12-11
Abstract
Abstract A visible immobilized specimen suspended in a stable, continuous gel where the gel is a transparent adduct of a cross-linked vinyl polymer and a water-soluble aldehyde. Such immobilized specimen is prepared by providing an optically transparent container, introducing into the container a liquid phase containing a watersoluble vinyl monomer, a water-soluble aldehyde, a cross-linking agent and a free radical producing catalyst. A specimen is positioned in the liquid phase and held in position until the polymerization of the liquid phase produces sufficient gel strength to immobilize the specimen. The container is then sealed to prevent evaporation.
Inventors
- 👤 John H Brown Jr
- 👤 Bobby L Atkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:20
CPC Classifications
A; A01; A01N; A01N1/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
The method of claim 1 wherein the vinyl monomer is acrylamide.
Claim 2
Dependent Claim
10 words
The method of claim 1 wherein the aldehyde is formaldehyde.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the cross-linking agent is an alkylidene bisacrylamide.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the aqueous solution contains from about 5 to about 20 weight percent water-soluble glycol based on the total weight of the gel.
Claim 5
Dependent Claim
34 words
The method of claim 1 wherein the aldehyde is formaldehyde and wherein such formaldehyde is present in a proportion of from about 0.5 to about 50 weight percent based on the vinyl monomer present.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the catalyst is K2S2O8 and Na2S2O5 activated with FeSO4.
References Cited (Backward Citations)
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |