Air pressure measuring pen

Details Air pressure measuring pen Air pressure measuring pen

1990-06-05

1992-06-02

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

73714, 73744, 116 34R, B60C 2302, G01L 716

Patent

active

051176840

ABSTRACT:
An air pressure measuring pen of a neat and satisfactory design is provided. The pen includes a transparent hollow pen tube having a top end and a bottom end, a clipping cover connected to the top end and having an exhaust valve, a check valve and a measuring head, a spring urging in the pen tube apart a stopping medium and a piston in the pen tube, an ink holder, and an ink holder positioner connected to the bottom end.

REFERENCES:
patent: 4501142 (1985-02-01), Huang
patent: 4768460 (1988-09-01), Soon-Fu
patent: 4966035 (1990-10-01), Huang

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