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US4509533A Expired / Lapsed US ⏱️ 0.0 years remaining

Fever thermometer

Assignee: Individual
•
Filing: 1982-09-20
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Granted: 1985-04-09
•
Expires: 2002-09-20
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Abstract

Abstract A fever thermometer having an adhesive on one side of a flexible backing web for adhering the web to the skin of the human body, the web being provided with a background color, and having a plurality of numerical display areas on the opposite side of the web, each numerical display area including an encapsulated liquid crystal indicator, the color spectrum of each liquid crystal indicator being responsive to a different specific temperature range, and the liquid crystal indicators being initially of a color to complement the background color so as to be subtantially invisible at temperatures below the minimum threshold temperature of the indicator having the lowest temperature range. A directional indicator is provided on the opposite side of the web for enabling adherence of the web with the numerical display areas in a predetermined attitude when the numerical display areas are substantially invisible at temperatures below the minimum threshold temperature so that the numerical display areas can be easily read when made visible at temperatures within the responsive temperature ranges of the liquid crystal indicators. The numerical display areas having liquid crystal indicators that indicate a fever condition are located at one side of the directional indicator, and the numerical display areas having liquid crystal indicators that indicate a non-fever condition are located at the opposite side of the directional indicator.

Inventors

  • 👤 Melvin Chervitz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 10:25
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165; G01K13/00; G01K13/20

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 265 words
A fever thermometer comprising: (a) a flexible backing web having two opposing sides, the web provided with a background color, (b) an adhesive on one side of the web for securing the web to the skin of the human body, (c) a plurality of numerical display areas on the opposite side of the web, each numerical display area including an encapsulated liquid crystal indicator, the color spectrum of each liquid crystal indicator being responsive to a different specific temperature range, and the liquid crystal indicators being initially of a color to complement the background color so as to be substantially invisible at temperature below a minimum threshold temperature of the indicator having the lowest temperature range, (d) a mask overlying the liquid crystal indicators, the mask being substantially the same color as the background color, and the mask being provided with windows disposed over and exposing the liquid crystal indicators to provide the numerical display areas, (e) a directional indicator on the web for enabling adherence of the web with the numerical display areas in a predetermined attitude when the numerical display areas are substantially invisible at temperatures below the minimum threshold temperature so that the numerical display areas can be easily read when made visible at temperatures within the responsive ranges of the liquid crystal indicators, and (f) the numerical display areas having liquid crystal indicators that indicate a fever condition being located at one side of the directional indicator, and the numerical display areas having liquid crystal indicators that indicate a non-fever condition being located at the opposite side of the directional indicator.
Claim 2
Dependent Claim 265 words
A fever thermometer comprising: (a) a flexible backing web having two opposing sides, the web provided with a background color, (b) an adhesive on one side of the web for securing the web to the skin of the human body, (c) a plurality of numerical display areas on the opposite side of the web, each numerical display area including an encapsulated liquid crystal indicator, the color spectrum of each liquid crystal indicator being responsive to a different specific temperature range, and the liquid crystal indicators being initially of a color to complement the background color so as to be substantially invisible at temperature below a minimum threshold temperature of the indicator having the lowest temperature range, (d) a mask overlying the liquid crystal indicators, the mask being substantially the same color as the background color, and the mask being provided with windows disposed over and exposing the liquid crystal indicators to provide the numerical display areas, (e) a directional indicator on the web for enabling adherence of the web with the numerical display areas in a predetermined attitude when the numerical display areas are substantially invisible at temperatures below the minimum threshold temperature so that the numerical display areas can be easily read when made visible at temperatures within the responsive ranges of the liquid crystal indicators, and (f) the numerical display areas having liquid crystal indicators that indicate a fever condition being located at one side of the directional indicator, and the numerical display areas having liquid crystal indicators that indicate a non-fever condition being located at the opposite side of the directional indicator.
Claim 3
Dependent Claim 24 words
A fever thermometer as defined in claim 1, in which: (g) the directional indicator is an arrow configuration located substantially midway of the web.
Claim 4
Dependent Claim 28 words
A fever thermometer as defined in claim 1, in which: (g) the directional indicator is of a color contrasting with the background color and visible at all times.

References Cited (Backward Citations)

US3661142A Cited
US3893340A Cited
US4070912A Cited
US4030482A Cited
US4156365A Cited
US4138889A Cited
US4198861A Cited
US4232684A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-04-08 1988-10-08 1989-04-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-04-08 1992-10-08 1993-04-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-04-08 1996-10-08 1997-04-09 $7700.00 Window Closed / Lapsed

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