Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1991-06-11
1993-02-09
Picard, Leo P.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
437219, 437224, 4284231, 257788, 257687, H01L 2328
Patent
active
051854988
ABSTRACT:
An acceleration sensor is packaged in an open can and encapsulated in an elastomeric polybutadiene compound which maintains its mechanical properties over a range of -40.degree. C. to 105.degree. C. and transmits acceleration to the sensor with a unity transfer function. The encapsulation material comprises about 90 to 100 pbw of polyol and about 20 pbw of isocyanate, the polyol consisting of at least 70% of hydroxy-polybutadiene. For enhanced adhesion a foaming agent and/or an epoxy is added to the mixture.
REFERENCES:
patent: 4871477 (1989-10-01), Dimanshteyn
patent: 5079270 (1992-01-01), Burkhart et al.
patent: 5079275 (1992-01-01), Durvasula et al.
Baird Dennis T.
Hermansen Ralph D.
Sanftleben Henry M.
Schnabel Petrina L.
Shelton Gary R.
Delco Electronics Corporation
Hughes Aircraft Company
Ledynh Bot L.
Picard Leo P.
Tung Randy W.
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