Elapsed time indicator

Details Elapsed time indicator Elapsed time indicator

1978-06-26

1980-10-21

Yasich, Daniel M.

Horology: time measuring systems or devices

Time interval

116206, 422 56, 116308, G04F 1306

Patent

active

042298130

ABSTRACT:
A time indicator which is substantially unaffected by variations in temperature. The indicator utilizes a silicone oil which is slowly absorbed onto and moves up a porous strip at a rate which is a function of time. One side of the strip is printed with an oil soluble ink, while the other side is unprinted. The printed side of the strip is laminated with polyethylene film to an unprinted strip. As the silicone oil moves up the strip, the oil contacts the ink causing a dye in the ink to migrate from the printed side to the unprinted side, thus providing a measurable color front moving up the strip. The oil is contained in a frangible ampul and a sponge with a small hole at the bottom is situated between the ampul and the strip. The indicator is substantially unaffected by normal variations in temperature and humidity.

REFERENCES:
patent: 2490933 (1949-12-01), Tornquist et al.
patent: 2716065 (1955-08-01), Beckett et al.
patent: 3055759 (1962-09-01), Busby et al.
patent: 3414415 (1968-12-01), Broad, Jr.
patent: 3520124 (1970-07-01), Myers
patent: 3620677 (1971-11-01), Morison
patent: 3954011 (1976-05-01), Manske
patent: 3958528 (1976-05-01), Hill
patent: 4028876 (1977-06-01), Delatorre
patent: 4038873 (1977-08-01), Kimmel
patent: 4148272 (1979-04-01), Wetzolf

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