Method for pressure measurement

Details Method for pressure measurement Method for pressure measurement

1976-10-05

1979-03-06

Esposito, Michael F.

Measuring and testing

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

Indicating coating or sheet providing direct visual indication

73141R, 427150, 427151, 427152, 427445, G01B 530

Patent

active

041424042

ABSTRACT:
A method for measuring pressures which comprises allowing a material whose pressure is to be measured to press against a recording sheet to form a color image due to the pressure, and evaluating the changes in the optical color density of the color hue of the resulting color image on the recording sheet, the color image formation due to the pressure being effected by contacting a synthetic polymer microcapsule layer containing a color former with a color developer layer under pressure, said microcapsule layer and said color developer layer being coated on the same surface of the support.

REFERENCES:
patent: 2730457 (1956-01-01), Green et al.
patent: 3469439 (1969-09-01), Roberts et al.
patent: 3647504 (1972-03-01), Hayes et al.
patent: 3922463 (1975-11-01), Masaoka et al.
patent: 3955026 (1976-05-01), Matsukawa et al.
patent: 4002060 (1977-01-01), Ogata et al.
patent: 4012538 (1977-03-01), Miyamoto et al.
patent: 4012554 (1977-03-01), Miller et al.
patent: 4085949 (1978-04-01), Asao et al.

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