US3794738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium dithionite stabilization against self-ignition
Assignee: Hoechst Celanese Chemical Co
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Filing: 1972-07-26
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Granted: 1974-02-26
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Expires: 1992-07-26
Abstract
Abstract To retard self-ignition of commercial grades of sodium dithionite when contacted with moisture and/or water, small but effective amounts of low concentration alkali metal and ammonium salts of diglycolic acid are added, said additive salts being beneficial to bleaching processes in which sodium dithionite may be used, while at the same time avoiding eutrophication of lakes and streams into which the bleaching effluent may ultimately flow.
Inventors
- 👤 L Ellis
- 👤 M Kise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:04
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/64; C01B17/66; C01B17/665; D; D06; D06L; D06L4/00; D06L4/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
13 words
The method according to claim 1 in which the salt comprises disodium diglycolate.
Claim 2
Dependent Claim
13 words
The method according to claim 1 in which the salt comprises dipotassium diglycolate.
Claim 3
Dependent Claim
13 words
The method according to claim 1 in which the salt comprises diammonium diglycolate.
Claim 4
Dependent Claim
45 words
The method according to claim 1 wherein the amount of additive salt is less than the sodium dithionite, the concentration of the additive salt being in concentration of 2.5 to 20.0 percent by weight relative to the overall product of sodium dithionite to be stored.
Claim 5
Dependent Claim
31 words
The method according to claim 2 in which the concentration of the sodium diglycolate is at 0.5 to 20.0 percent relative to the overall product of sodium dithionite to be stored.
Claim 6
Dependent Claim
30 words
The method according to claim 3 wherein the dipotassium diglycolate is at a concentration of 3.0 to 20.0 percent, relative to the overall product of sodium dithionite to be stored.
Claim 7
Dependent Claim
31 words
The method according to claim 4 in which the ammonium diglycolate is at the concentration of 5.0 to 15.0 percent rElative to the overall product of sodium dithionite to be stored.
Claim 8
Dependent Claim
47 words
The method according to claim 2 wherein sodium carbonate is added in a concentration of 10.0 percent, relative to the overall product of sodium dithionite to be stored and the disodium diglycolate is in a concentration range of 2.5 to 10.0 percent relative to said sodium dithionite.
Claim 9
Dependent Claim
37 words
A bleaching agent composition of matter comprising in relative percentages by weight, the compounds: A. dry sodium dithionite 80.0 to 99.5 percent; B. the group alkali metal and ammonium salts of diglycolic acid 20 to 0.5 percent.
Claim 10
Dependent Claim
29 words
A bleaching agent composition of matter comprising in relative percentages by weight, the following: A. dry sodium dithionite 99.5 to 80.0 percent; B. disodium diglycolate 0.5 to 20.0 percent.
Claim 11
Dependent Claim
34 words
A bleaching agent composition of matter comprising the following: A. dry sodium dithionite 87.5 to 80.0 percent by weight; B. 10.0 percent by weight of sodium carbonate; C. 2.5 - 10.0 percent disodium diglycolate.
Claim 12
Dependent Claim
31 words
A composition of matter bleaching agent comprising in percentage by weight: A. dry sodium dithionite at 97.0 - 80.0 percent commercial grade sodium dithionite; B. 3.0 - 20.0 percent dipotassium diglycolate.
Claim 13
Dependent Claim
27 words
A composition of matter bleaching agent comprising in percentage by weight: A. 95.0 - 85.0 percent sodium dithionite; B. ammonium diglycolate 5.0 - 15.0 percent by weight.
References Cited (Backward Citations)
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US3353909A
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |