Patent US4289088A successfully refreshed from Google Patents.
US4289088A
Expired / Lapsed
US
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Sterility indicating device
Assignee: 3M Co
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Filing: 1980-04-29
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Granted: 1981-09-15
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Expires: 2000-04-29
Abstract
Abstract A device for indicating the attainment of a sterile condition in an autoclave is described. The device provides a yes/no indication of the attainment of sterility through the use of a fusible material to prevent premature indication. The fusible material has the formula ##STR1## wherein said --OR 1 group is located ortho or meta to said ##STR2##
Inventors
- 👤 John V. Scibelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:19
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06; G01K3/00; G01K3/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
A device for indicating the attainment of sterility in a steam autoclave comprising an elongate hollow element having means for permitting steam to enter the hollow portion thereof; an indicating means within said hollow element that is movable relative to said hollow element; a biasing means for causing movement of said indicating means relative to said hollow element; and a restraining means within said hollow element for preventing movement of said indicating means until the attainment of a predetermined temperature in the presence of steam, whereupon said restraining means fuses and permits said biasing means to move said indicating means relative to said hollow element thereby indicating the attainment of sterility, said restraining means having the formula ##STR6## wherein R 1 is a lower alkyl group containing from 1 to about 4 carbon atoms, and R 2 is selected from hydrogen and lower alkyl groups containing from 1 to about 4 carbon atoms, and wherein said --OR 1 is located ortho or meta to said ##STR7##
Claim 2
Independent Claim
166 words
A device for indicating the attainment of sterility in a steam autoclave comprising an elongate hollow element having means for permitting steam to enter the hollow portion thereof; an indicating means within said hollow element that is movable relative to said hollow element; a biasing means for causing movement of said indicating means relative to said hollow element; and a restraining means within said hollow element for preventing movement of said indicating means until the attainment of a predetermined temperature in the presence of steam, whereupon said restraining means fuses and permits said biasing means to move said indicating means relative to said hollow element thereby indicating the attainment of sterility, said restraining means having the formula ##STR6## wherein R 1 is a lower alkyl group containing from 1 to about 4 carbon atoms, and R 2 is selected from hydrogen and lower alkyl groups containing from 1 to about 4 carbon atoms, and wherein said --OR 1 is located ortho or meta to said ##STR7##
Claim 3
Dependent Claim
11 words
A device according to claim 1 wherein R 1 is ethyl.
Claim 4
Dependent Claim
11 words
A device according to claim 2 wherein R 2 is hydrogen.
Claim 5
Dependent Claim
12 words
A device according to claim 3 wherein said restraining means is 2-ethoxybenzamide.
Claim 6
Dependent Claim
17 words
A device according to claim 1 wherein said elongate hollow element has at least one open end.
Claim 7
Dependent Claim
15 words
A device according to claim 1 wherein said elongate hollow element comprises a polymeric material.
Claim 8
Dependent Claim
13 words
A device according to claim 6 wherein said polymeric material comprises a polyamide.
Claim 9
Dependent Claim
11 words
A device according to claim 7 wherein said polyamide comprises nylon-6.
Claim 10
Dependent Claim
15 words
A device according to claim 1 wherein said elongate hollow element substantially comprises a cylinder.
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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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |