US3872822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable temperature indicator
Assignee: Becton Dickinson and Co
•
Filing: 1973-08-20
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Granted: 1975-03-25
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Expires: 1993-08-20
Abstract
Abstract A disposable fever indicator is provided to determine whether or not a predetermined body temperature has been reached. The indicator comprises a movable member having portions disposed within a vessel and held at a first position by a material meltable at the predetermined temperature. The indicator further includes means exerting a force on the member for urging the member from the first position to a second position and removable means are provided for constraining the member in said first position.
Inventors
- 👤 Waldemar A Ayres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:08
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A fever indicator for determining temperatures above a predetermined value comprising: an elongated vessel having a closed end and an open top end, a movable elongated rod member having a first end portion disposed within said vessel at a first position, means bonding said first end of the movable member to a section of said vessel at said first position, said bonding means comprising a material meltable at said predetermined temperature, means on said open top end exerting a resilient force on said member for urging said member toward a second position, and selectively removable means engaging said top open end for constraining said member to said first position even after the predetermined temperature is reached.
Claim 2
Dependent Claim
116 words
A fever indicator for determining temperatures above a predetermined value comprising: an elongated vessel having a closed end and an open top end, a movable elongated rod member having a first end portion disposed within said vessel at a first position, means bonding said first end of the movable member to a section of said vessel at said first position, said bonding means comprising a material meltable at said predetermined temperature, means on said open top end exerting a resilient force on said member for urging said member toward a second position, and selectively removable means engaging said top open end for constraining said member to said first position even after the predetermined temperature is reached.
Claim 3
Dependent Claim
43 words
The fever indicator in accordance with claim 1 wherein said member comprises a piston, said force exerting means comprises a compressed spring bearing against said piston and said constraining means is positioned to prevent movement of the piston under action of said spring.
Claim 4
Dependent Claim
57 words
The fever indicator in accordance with claim 2 wherein said spring is disposed within said vessel to urge said piston toward said open end and said constraining means comprises a removable closure for said open end, said closure includes portions adapted to bear against said piston whereby to prevent its movement under the action of the spring.
Claim 5
Dependent Claim
70 words
The fever indicator in accordance with claim 3 wherein said bonding means is disposed at the bottom of said vessel, said piston is disposed adjacent the top end of said vessel and further comprising a rod having one end affixed to said piston and an opposite end extending into and secured to said bonding material whereby said rod and hence said piston is prevented from movement by said bonding material.
References Cited (Backward Citations)
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Cited
US3682130A
Cited
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Cited
US3820499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |