Patent US3961976A successfully refreshed from Google Patents.
US3961976A
Expired / Lapsed
US
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Method of preparing size
Assignee: SCA Development AB
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Filing: 1975-04-25
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Granted: 1976-06-08
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Expires: 1995-04-25
Abstract
Abstract An improved fuse size, as well as a method for preparing same, are disclosed. Specifically, the fuse size disclosed includes a combination of urea and carboxymethyl cellulose, preferably including added starch. The method disclosed includes combining the urea and carboxymethyl cellulose, heating the mixture, and then adding an oxidizing agent to the mixture in the presence of a metal ion which has at least two oxidation stages, but which is in the lower of said oxidation stages when added thereto. In a preferred embodiment, the oxidizing agent employed comprises hydrogen peroxide, and the metal ion is preferably bivalent iron, added in the form of a ferrous salt such as ferrous chloride.
Inventors
- 👤 Alf Hugo Karlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:31
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08B; C08B15/00; C08K3/10; C08K3/18; C08K5/00; C08K5/16; C08K5/21; C08L; C08L1/00; C08L1/08; C08L1/26; C08L3/00; C08L3/02; C09; C09J; C09J101/00; C09J101/08; C09J101/26; C08L2666/00; C08L2666/02; C08L2666/28; C08L2666/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
A method of preparing fuse size which comprises combining carboxymethyl cellulose and urea, heating said combination, and adding an oxidizing agent to said heated combination in the presence of a metal ion, said metal ion having at least two oxidation stages and being in the lower of said two oxidation stages.
Claim 2
Independent Claim
51 words
A method of preparing fuse size which comprises combining carboxymethyl cellulose and urea, heating said combination, and adding an oxidizing agent to said heated combination in the presence of a metal ion, said metal ion having at least two oxidation stages and being in the lower of said two oxidation stages.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said oxidizing agent comprises hydrogen peroxide.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said metal ion is bivalent.
Claim 5
Dependent Claim
13 words
The method of claim 3 in which said bivalent metal ion comprises iron.
Claim 6
Dependent Claim
12 words
The method of claim 4 wherein said bivalent ion comprises ferrous chloride.
Claim 7
Dependent Claim
18 words
The method of claim 1, including adding starch to said combination of said carboxymethyl cellulose and said urea.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein said heating is carried out at a temperature of about 100° C.
Claim 9
Dependent Claim
24 words
The method of claim 1, including more than about 3% of said carboxymethyl cellulose in said combination of said carboxymethyl cellulose and said urea.
Claim 10
Dependent Claim
39 words
An improved fuse size comprising a combination of carboxymethyl cellulose and urea, said urea being present in an amount of between about 10% and 90%, and such carboxymethyl cellulose being present in an amount of greater than about 3%.
Claim 11
Dependent Claim
39 words
An improved fuse size comprising a combination of carboxymethyl cellulose and urea, said urea being present in an amount of between about 10% and 90%, and such carboxymethyl cellulose being present in an amount of greater than about 3%.
Claim 12
Dependent Claim
12 words
The fuse size of claim 9, including up to about 87% starch.
References Cited (Backward Citations)
US2487766A
Cited
US3778392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |