Piston for precision dosing instrument

Details Piston for precision dosing instrument Piston for precision dosing instrument

1982-09-15

1985-02-26

Cohen, Irwin C.

Expansible chamber devices

Piston

Nonmetallic portion

291565R, 92254, 604222, 604230, B23P 1510, F16J 102

Patent

active

045011923

ABSTRACT:
A piston for a precision dosing instrument includes a cylindrical core which may be made of glass, ceramic or metal, and a precision ground sleeve of polytetrafluorethylene disposed over the core. One end of the sleeve is closed while the core is open at both ends but the openings may have different diameters.

REFERENCES:
patent: 2315944 (1943-04-01), Dick
patent: 2607342 (1952-08-01), Abel
patent: 2895773 (1959-07-01), McConnaughey
patent: 3237815 (1966-03-01), Ogle
patent: 4315454 (1982-02-01), Knodel

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