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US4128397A
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Sulfur dioxide liberation compositions and methods of using same
Assignee: Rentokil Ltd
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Filing: 1975-10-31
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Granted: 1978-12-05
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Expires: 1995-10-31
Abstract
Abstract Compositions capable of giving extended release of sulphur dioxide, for use as sterilizing compositions especially in the temporary disposal of soiled sanitary and surgical dressings, comprising a sulphur-dioxide-liberation compound, for example a metabisulphite or a dithionite, and a sulfur-dioxide-liberation moderator, especially a thiosulphate and/or a phosphate.
Inventors
- 👤 David J. Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:05
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/046; A01; A01N; A01N59/00; A01N59/02; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/64
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
89 words
A sterilizing composition capable fof giving extended release of sulphur dioxide in the presence of moisture, consisting essentially of: (a) a compound that will liberate sulphur dioxide in contact with water; and a water-soluble thiosulphate which acts as a moderator for the release of said sulphur dioxide said components a and b being present in amounts such that it is possible to produce sulphur dioxide from the composition sufficiently slowly that the composition is not rapidly exhausted but continues to liberate sulphur dioxide for a prolonged period of time.
Claim 2
Dependent Claim
89 words
A sterilizing composition capable fof giving extended release of sulphur dioxide in the presence of moisture, consisting essentially of: (a) a compound that will liberate sulphur dioxide in contact with water; and a water-soluble thiosulphate which acts as a moderator for the release of said sulphur dioxide said components a and b being present in amounts such that it is possible to produce sulphur dioxide from the composition sufficiently slowly that the composition is not rapidly exhausted but continues to liberate sulphur dioxide for a prolonged period of time.
Claim 3
Dependent Claim
18 words
A composition as claimed in claim 1, wherein the sulphur dioxide-liberating compound is a metabisulphite or a dithionite.
Claim 4
Dependent Claim
34 words
A composition as claimed in claim 2, wherein the sulphur dioxide-liberating compound is a metabisulphite, said composition further comprising, as an additional moderator for the release of sulphur dioxide, a water soluble phosphate buffer.
Claim 5
Dependent Claim
35 words
A composition as claimed in claim 2, wherein the sulphur dioxide-liberating compound is a dithionite, said composition further comprising, as an additional moderator for the release of sulphur dioxide, an amine or a borate buffer.
Claim 6
Dependent Claim
13 words
A composition as claimed in claim 3, wherein the metabisulphite is sodium metabisulphite.
Claim 7
Dependent Claim
13 words
A composition as claimed in claim 2, wherein the dithionite is sodium dithionite.
Claim 8
Dependent Claim
13 words
A composition as claimed in claim 1, wherein the thiosulphate is sodium thiosulphate.
Claim 9
Dependent Claim
13 words
A composition as claimed in claim 2, wherein the phosphate is an orthophosphate.
Claim 10
Dependent Claim
19 words
A composition as claimed in claim 4, wherein the borate is present as borax or a boric acid-borate mixture.
Claim 11
Dependent Claim
14 words
A composition as claimed in claim 4, wherein the amine is present as triethylamine.
Claim 12
Dependent Claim
11 words
A composition as claimed in claim 1, additionally comprising a perfume.
Claim 13
Dependent Claim
16 words
A composition as claimed in claim 1, additionally comprising an auxiliary to improve its free-flowing properties.
Claim 14
Dependent Claim
14 words
A composition as claimed in claim 1, in the form of an aqeous solution.
Claim 15
Dependent Claim
31 words
A method of sterilizing an article, which comprises bringing the article into contact with or into the proximity of a composition as claimed in claim 1 in the presence of moisture.
Claim 16
Dependent Claim
36 words
A method as claimed in claim 14, wherein the article is brought into contact with or into the proximity of the composition by being placed into a closed container containing a aqueous solution of the composition.
Claim 17
Dependent Claim
57 words
A method as claimed in claim 15, wherein the container is a "trap-top" container having a pivoted top which when opened presents a shelf on which the article to be placed in the container can be placed while keeping the container sealed and which allows the article to drop into the container when the lid is closed.
Claim 18
Dependent Claim
17 words
A method as claimed in claim 14 wherein the article is a soiled sanitry or surgical dressing.
Claim 19
Dependent Claim
37 words
A method as claimed in claim 14 wherein the article is brought into a region in the proximity of the composition in which the concentration of sulphur dioxide liberated from the composition is at least 10 p.p.m.
Claim 20
Dependent Claim
16 words
A method as claimed in claim 18, wherein said concentration is not more than 500 p.p.m.
Claim 21
Dependent Claim
20 words
A method as claimed in claim 18, wherein said concentration is within the range of from 75 to 200 p.p.m.
Claim 22
Dependent Claim
45 words
A method as claimed in claim 15, wherein the article is a soiled sanitary or surgical dressing which is brought into a region in the proximity of the composition in which the contraction of sulphur dioxide liberated from the composition is at least 10 p.p.m.
References Cited (Backward Citations)
US3105790A
Cited
US3928577A
Cited
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 |