pH pen case design

Details pH pen case design pH pen case design

1993-03-02

1994-10-25

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

D10 78

Patent

active

D03518035

REFERENCES:
patent: D312421 (1990-11-01), Trottmann
patent: 4090925 (1978-05-01), Jungman
patent: 4912417 (1990-03-01), Gibboney et al.
patent: 5198093 (1993-03-01), Sydlowski et al.
Cole-Palmer; pH Electronic Paper & TDS Pocket Indicators; .COPYRGT.1989.
Annual Design Review; Pocket pH; p. 84; Industrial Design.

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