US4222745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicator for detection of SO2 leakage
Assignee: United States Department of the Air Force
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Filing: 1978-11-08
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Granted: 1980-09-16
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Expires: 1998-11-08
Abstract
Abstract A composition of matter comprising a mixture of (1) finely divided silica containing adsorbed potassium dichromate and (2) a polymeric adhesive material. The composition is particularly useful as an indicator for detecting the leakage of sulfur dioxide from cells and batteries.
Inventors
- 👤 James S. Cloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:25
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/50; H01M6/5044; G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/224; H01M10/00; H01M10/42; H01M10/4228; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/186
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
A composition of matter having a paste-like consistency comprising a mixture of (1) potassium dichromate adsorbed on finely divided silica and (2) a silicone rubber.
Claim 2
Dependent Claim
25 words
A composition of matter having a paste-like consistency comprising a mixture of (1) potassium dichromate adsorbed on finely divided silica and (2) a silicone rubber.
Claim 3
Dependent Claim
59 words
The composition according to claim 1 in which the amount of potassium dichromate adsorbed on the silica ranges from about 3 to 5 parts by weight per 100 parts by weight of silica and the amount of silica containing adsorbed potassium dichromate ranges from about 20 to 60 parts by weight per 100 parts by weight of silicone rubber.
Claim 4
Dependent Claim
14 words
The composition according to claim 2 in which the silicone rubber is a polydimethylsiloxane.
Claim 5
Dependent Claim
39 words
The composition according to claim 2 in which the silicone rubber has the following formula: ##STR2## wherein n is an integer having a value such that the molecular weight of the silicone rubber ranges from about 1000 to 4000.
Claim 6
Independent Claim
97 words
A method of detecting the leakage from lithium-sulfur dioxide, lithium thionyl chloride or lithium sulfuryl chloride cells of sulfur dioxide or sulfur dioxide generated by leakage of precursor materials, said method comprising the steps of applying to surfaces of the cells a composition yellow in color and having a paste-like consistency, said composition comprising a mixture of (1) potassium dichromate adsorbed on finely divided silica and (2) silicone rubber; and observing the composition so as to detect any color change therein, a change in color from yellow to bluish-green indicating leakage of sulfur dioxide or precursor materials.
Claim 7
Independent Claim
97 words
A method of detecting the leakage from lithium-sulfur dioxide, lithium thionyl chloride or lithium sulfuryl chloride cells of sulfur dioxide or sulfur dioxide generated by leakage of precursor materials, said method comprising the steps of applying to surfaces of the cells a composition yellow in color and having a paste-like consistency, said composition comprising a mixture of (1) potassium dichromate adsorbed on finely divided silica and (2) silicone rubber; and observing the composition so as to detect any color change therein, a change in color from yellow to bluish-green indicating leakage of sulfur dioxide or precursor materials.
Claim 8
Dependent Claim
51 words
The method of according to claim 5 in which the composition comprises about 3 to 5 parts by weight of potassium dichromate per 100 parts by weight of silica and about 20 to 60 parts by weight of silica containing adsorbed potassium dichromate per 100 parts by weight of silicone rubber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |