US4128437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparentizing agent for paper
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1976-05-28
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Granted: 1978-12-05
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Expires: 1996-05-28
Abstract
Abstract A transparentizing composition for paper comprising a compound having the formula: <IMAGE> <IMAGE> or salts thereof and a solvent.
Inventors
- 👤 Shigeru Ura
- 👤 Norio Kondo
- 👤 Yoshiya Fukuyama
- 👤 Makoto Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:26
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/26; G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/785; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A transparentizing composition for paper comprising at least member selected from the group consisting of a compound of the formula: ##STR12## and the alkali metal, ammonium and lower alkyl amine salts thereof; and a solvent selected from the group consisting of water and organic solvents.
Claim 2
Dependent Claim
45 words
A transparentizing composition for paper comprising at least member selected from the group consisting of a compound of the formula: ##STR12## and the alkali metal, ammonium and lower alkyl amine salts thereof; and a solvent selected from the group consisting of water and organic solvents.
Claim 3
Dependent Claim
30 words
The transparentizing composition of claim 1, wherein the amount of the compound is about 10 to 70% by weight based on the total weight of the compound and the solvent.
Claim 4
Dependent Claim
18 words
The transparentizing composition of claim 1, wherein said organic solvent is methanol, ethanol, isopropanol, acetone, toluene or ethylcellosolve.
References Cited (Backward Citations)
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US3893959A
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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) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |