Equipment for disclosing pressure

Details Equipment for disclosing pressure Equipment for disclosing pressure

2005-09-13

2005-09-13

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Indicating coating or sheet providing direct visual indication

C473S278000

Reexamination Certificate

active

06941818

ABSTRACT:
The invention relates to equipment such as for detecting and providing visual confirmation of pressure thereon, e.g. from an impact, which comprises an article having a sandwich construction with a pressure-disclosing layer (3) comprising a liquid crystal, thermochromic material, and a temperature differential layer (5), separated by a layer (4) providing a compressible mechanical shield between the pressure-disclosing layer and the temperature-differential layer. Material according to the invention can be employed to indicate the boundaries of a tennis court, or sports playing areas, or as a golf training aid, among other uses.

REFERENCES:
patent: 5223958 (1993-06-01), Berry
patent: 5394824 (1995-03-01), Johnson
patent: 5597361 (1997-01-01), Hope
patent: 5805245 (1998-09-01), Davis
patent: 5841285 (1998-11-01), Bailey
patent: 5925480 (1999-07-01), Shacklett et al.
patent: 1006121 (1994-05-01), None
patent: 4100434 (1992-07-01), None
patent: WO 94/28982 (1994-12-01), None

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