US3982538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety valves for protection against liquid contamination
Assignee: Internationale Octrooi Maatschappij Octropa BV
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Filing: 1974-07-08
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Granted: 1976-09-28
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Expires: 1994-07-08
Abstract
Abstract A safety valve which may be used in a pipette or in medical or biological equipment such as collection bottles, employs a carrier which is inserted in a flow line and contains a material which swells in the presence of an unwanted fluid to block the line and provide protection against contamination.
Inventors
- 👤 Anthony Nelson Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:13
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/56; B01L3/567; A; A61; A61M; A61M1/00; A61M1/71; A61M1/78; A61M1/88; A61M1/882; G; G01; G01N; G01N35/00; G01N35/10; G01N35/1009; G01N35/1016; G01N2035/102; G01N2035/1023; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3084
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A safety valve for protection against fluid contamination comprising a hollow carrier adapted for insertion in a flow-line and containing a valve element consisting essentially of a granular or powdered gelling material which allows the flow through said carrier of gas in the absence of water, but which in the presence of water swells to block said carrier and prevent further flow, said gelling material being selected from the group consisting of gelatine, sodium alginate, agar, sodium carboxy methyl cellulose and swellable starch derivatives.
Claim 2
Dependent Claim
84 words
A safety valve for protection against fluid contamination comprising a hollow carrier adapted for insertion in a flow-line and containing a valve element consisting essentially of a granular or powdered gelling material which allows the flow through said carrier of gas in the absence of water, but which in the presence of water swells to block said carrier and prevent further flow, said gelling material being selected from the group consisting of gelatine, sodium alginate, agar, sodium carboxy methyl cellulose and swellable starch derivatives.
Claim 3
Dependent Claim
79 words
A safety valve for protection against fluid contamination comprising a hollow carrier adapted for insertion in a flow-line and containing a valve element consisting essentially of a granular or powdered gelling material which allows the flow through said carrier of water in the absence of hydrocarbon liquid in the water, but which in the presence of hydrocarbon liquids in the water swells to block said carrier and prevent further flow, said gelling material consisting of swellable hydrocarbon polymer granules.
Claim 4
Dependent Claim
79 words
A safety valve for protection against fluid contamination comprising a hollow carrier adapted for insertion in a flow-line and containing a valve element consisting essentially of a granular or powdered gelling material which allows the flow through said carrier of water in the absence of hydrocarbon liquid in the water, but which in the presence of hydrocarbon liquids in the water swells to block said carrier and prevent further flow, said gelling material consisting of swellable hydrocarbon polymer granules.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |