Patent US4534945A successfully refreshed from Google Patents.
US4534945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of high purity hydrogen peroxide
Assignee: FMC Corp
•
Filing: 1984-05-03
•
Granted: 1985-08-13
•
Expires: 2004-05-03
Abstract
Abstract An aqueous 25% to 35% solution of hydrogen peroxide with a residue on evaporation of 20 mg/l or less are stabilized against decomposition by a maximum of 1.4 mg/l tin. The tin is maintained in the solution in the form of a very fine colloidal sol by the addition of a maximum of 2-5 mg/kg of phosphate added as a phosphonic acid and a maximum of 5.5 mg/kg of a hydroxycarboxylic acid.
Inventors
- 👤 Quentin G. Hopkins
- 👤 Jhonce N. Browning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:36
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/037
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
A 25% to 35% aqueous solution of hydrogen peroxide stabilized against decomposition in the presence of polyvalent cations so as to exhibit a maximum residue on evaporation of 20 mg/l comprising as a stabilizer 0.1 to 1.4 mg/kg of tin, 0.1 to 2.5 mg/kg of phosphate added as an organic phosphonic acid and 0.1 to 5.5 mg/kg of citric acid.
Claim 2
Dependent Claim
60 words
A 25% to 35% aqueous solution of hydrogen peroxide stabilized against decomposition in the presence of polyvalent cations so as to exhibit a maximum residue on evaporation of 20 mg/l comprising as a stabilizer 0.1 to 1.4 mg/kg of tin, 0.1 to 2.5 mg/kg of phosphate added as an organic phosphonic acid and 0.1 to 5.5 mg/kg of citric acid.
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein the organic phosphonic acid is amino tris(methylenephosphonic acid).
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein the organic phosphonic acid is ethylenediamine tetra(methylenephosphonic acid).
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein the organic phosphonic acid is 1-hydroxyethyl-1,1-diphosphonic acid.
Claim 6
Independent Claim
69 words
A method for stabilizing an aqueous solution of 25% to 35% hydrogen peroxide against decomposition in the presence of polyvalent cations so as to exhibit a maximum residue on evaporation of 20 mg/l comprising incorporating into the hydrogen peroxide 0.1 to 1.4 mg/kg of tin, 0.1 to 2.5 mg/kg of phosphate added as an organic phosphonic acid and 0.1 to 5.5 mg/kg of citric acid or a salt thereof.
Claim 7
Independent Claim
69 words
A method for stabilizing an aqueous solution of 25% to 35% hydrogen peroxide against decomposition in the presence of polyvalent cations so as to exhibit a maximum residue on evaporation of 20 mg/l comprising incorporating into the hydrogen peroxide 0.1 to 1.4 mg/kg of tin, 0.1 to 2.5 mg/kg of phosphate added as an organic phosphonic acid and 0.1 to 5.5 mg/kg of citric acid or a salt thereof.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein the organic phosphonic acid is amino tris(methylenephosphonic acid).
Claim 9
Dependent Claim
14 words
The method of claim 5 wherein the organic phosphonic acid is ethylenediamine tetra(methylenephosphonic acid).
Claim 10
Dependent Claim
13 words
The method of claim 5 wherein the organic phosphonic acid is 1-hydroxyethyl-1,1-diphosphonic acid.
References Cited (Backward Citations)
US946529A
Cited
US1002854A
Cited
US1128637A
Cited
US2426154A
Cited
US3194768A
Cited
US3234140A
Cited
US3383174A
Cited
US3387939A
Cited
US3681022A
Cited
US3687627A
Cited
US3701825A
Cited
DE2109495A1
Cited
US3801512A
Cited
US3781409A
Cited
US3864271A
Cited
US4070442A
Cited
US4061721A
Cited
EP0097305A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |