Patent US3649331A successfully refreshed from Google Patents.
US3649331A
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Method of treating cellulose sponges and resulting products
Assignee: General Mills Inc
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Filing: 1968-05-10
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Granted: 1972-03-14
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Expires: 1988-05-10
Abstract
Abstract A portion of at least one of the surfaces of a dry, compressed, regenerated cellulose sponge is treated with a liquid cellulose degrading substance to render the said treated portion incapable of expanding to its normal volume.
Inventors
- 👤 Lowell E Peterson
- 👤 Lyle F Elmquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J2301/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
17 words
The method of claim 1 wherein the liquid cellulose degrading substance is applied in a geometric pattern.
Claim 2
Dependent Claim
21 words
The method of claim 2 wherein the liquid cellulose degrading substance is applied to more than one side of the sponge.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the sponge is compressed so that the original volume thereof is reduced from about 50 to 75 percent.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the liquid cellulose degrading substance is an aqueous solution containing about 40 to 90 percent by weight of ZnCl2.
Claim 5
Dependent Claim
56 words
The process of claim 1 wherein the cellulose sponge is compressed to about 33 percent of its original volume, the liquid cellulose degrading substance is an aqueous solution containing about 75 percent by weight ZnCl2 and the said substance is applied in a manner dividing at least one of the surfaces of the sponge into squares.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the treated sponge is expanded.
Claim 7
Dependent Claim
9 words
The article prepared by the process of claim 1.
Claim 8
Dependent Claim
9 words
The article prepared by the process of claim 7.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |