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US3669895A Expired / Lapsed US ⏱️ 0.0 years remaining

Sodium hydrosulfite stabilization composition

Assignee: Hoechst Celanese Chemical Co
•
Filing: 1970-08-31
•
Granted: 1972-06-13
•
Expires: 1990-08-31
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Abstract

Abstract The present discovery entails a new means for stabilizing mixtures, containing primarily sodium dithionite, from spontaneous decomposition and ''''ignition'''' by the action of water. Specifically, the invention comprises stabilization of sodium hydrosulfite against spontaneous decomposition in the presence of water, using effective quantities of additives, which still in no way lessen the bleaching activity that would be developed by an equivalent quantity of sodium hydrosulfite. The stabilizing agents consist of oxalic acid and a water soluble inorganic carbonate. This mixture can be further improved as to stabilization and bleaching effect by the addition of borax (Na2B4O7 1 10 H2 O). The bleaching effect may be improved by adding a water soluble inorganic sulfite.

Inventors

  • 👤 Shiri Shastri

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 16:25
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/64; C01B17/66; C01B17/665

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 13 words
The composition of matter of claim 1, and borax as a further additive.
Claim 2
Dependent Claim 16 words
The composition of matter of claim 2, and a water soluble inorganic sulfite as further additive.
Claim 3
Dependent Claim 32 words
The composition of matter of claim 1 wherein the inorganic carbonate is selected from the group consisting of sodium hydrogen carbonate and mixtures thereof and sodium carbonate as water soluble inorganic carbonates.
Claim 4
Dependent Claim 32 words
The composition of matter of claim 2 wherein the inorganic carbonate is selected from the group consisting of sodium hydrogen carbonate and mixtures thereof and sodium carbonate as water soluble inorganic carbonates.
Claim 5
Dependent Claim 32 words
The composition of matter of claim 3 wherein the inorganic carbonate is selected from the group consisting of sodium hydrogen carbonate and mixtures thereof and sodium carbonate as water soluble inorganic carbonates.
Claim 6
Dependent Claim 29 words
The composition of matter of claim 3 in which the water soluble inorganic sulfite is selected from the group consisting of sodium sulfite and sodium bisulfite and mixtures thereof.
Claim 7
Dependent Claim 29 words
The composition of matter of claim 4 in which the water soluble inorganic sulfite is selected from the group consisting of sodium sulfite and sodium bisulfite and mixtures thereof.
Claim 8
Dependent Claim 29 words
The composition of matter of claim 1 wherein the proportion of additives in percentage by weight to sodium hydrosulfite is: A. oxalic acid 1-25 percent; B. carbonate 1-3 percent.
Claim 9
Dependent Claim 24 words
The composition of matter of claim 9 wherein a further additive, borax, comprises in proportion by weight relative to the sodium hydrosulfite, 1-5 percent.
Claim 10
Dependent Claim 24 words
The composition of matter of claim 9 wherein a further additive of sulfites comprises in proportion by weight relative to the hydrosulfite 0.5-1 percent.

References Cited (Backward Citations)

US2516321A Cited
US3054658A Cited
US3353909A Cited
US3468623A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-06-13 1975-12-13 1976-06-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-06-13 1979-12-13 1980-06-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-06-13 1983-12-13 1984-06-13 $7700.00 Window Closed / Lapsed

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