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Primary Examiner: Hess, Bruce H.
Assistant Examiner:
Attorney: Young; Francis W., Carter; David M.

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Title: Temperature indicating device using a pressure sensitive polyisobutylene adhesive seal

Abstract: There is provided a temperature indicating device such as a thermometer having a thermally conductive foil as a carrier layer, the carrier layer having one or more cavities formed by depression in the foil material. The depressions are filled with solid mixtures which melt at predetermined temperatures and are composed of ortho-chloronitrobenzene, ortho-bromonitrobenzene, and a dyestuff. A transparent cover layer seals the cavities and their contents. The transparent cover layer and carrier layer are bonded to each other by means of a pressure-sensitive adhesive which includes polyisobutylene.

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Other info:

Inventors: Giezen, Egenius A. (Rheden, NL)
van Houwelingen, Gerrit D. B. (Otterlo, NL)
Cramer, Marietta (Arnhem, NL)

Application Number: 896114
Filing Date: 1978-04-13
Publication_date: 1980-02-26
Assignee: Akzona Incorporated (Asheville, NC)
Primary Class(es): 374/104 116/216, 116/219, 428/164, 428/165, 428/336, 428/339, 428/462, 428/521, 428/913
Other Classes:
US Patent Ref:

3002385	Oct, 1961	Wahl et al.	116/114.
3704985	Dec, 1972	Pickett et al.	73/356.
3765243	Oct, 1973	Pickett et al.	73/356.
3826141	Jul, 1974	Pickett et al.	73/356.
3922917	Dec, 1975	Ayres	73/356.
3946612	Mar, 1976	Sagi et al.	73/356.

Other Refs: Other References: Houwink et al., Adhesion and Adhesives, Elsevier Pub. Co., N.Y., vol. 2, 1967, p. 36.
Colour Index, 3rd Ed., vol. 3, 1971, pp. 3563, 3564, 3620, 3621, 3624, 3625, 3626, 3627, 3602, 3603, 3588, 3589, 3634, 3635.