Time-lapse indicator or the like

Details Time-lapse indicator or the like Time-lapse indicator or the like

1978-07-28

1980-06-10

Yasich, Daniel M.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

338222, 116308, 368107, G07F 902

Patent

active

042068380

ABSTRACT:
A time-lapse indicator in which a receptacle contains a fluid material having numerous discrete particles dispersed in a liquid carrier, and a layer of absorbent material in close proximity to the receptacle, the receptacle and absorbent material being separated from one another by a wall which is broken when the time period is to be determined by the indicator. The indicator normally has a pair of electrodes for measuring the resistance of the fluid material after a portion of the liquid carrier has been absorbed therefrom in the absorbent material. Mechanisms for both activating and reading the indicator may be used.

REFERENCES:
patent: 2746745 (1956-05-01), Damon
patent: 2917814 (1959-12-01), Ruckelshaus
patent: 3046786 (1962-07-01), Tessem
patent: 3273683 (1966-09-01), Goodman
patent: 3480402 (1969-11-01), Jackson
patent: 3520124 (1970-07-01), Myers
patent: 3539470 (1970-11-01), Icre
patent: 3679976 (1972-07-01), Ogawa et al.
patent: 3998307 (1976-12-01), Volben et al.
patent: 4086475 (1978-04-01), Churchill

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