Timer

Details Timer Timer

1984-11-19

1985-07-09

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Gravity actuated type

G04F 104

Patent

active

045279055

ABSTRACT:
A timer of the hourglass sand type which includes a plurality of chambers that are interconnected by conduit means. The conduit means are cooperate so that after one chamber empties a second chamber empties.

REFERENCES:
patent: D209531 (1967-12-01), Koch
patent: 1124543 (1915-01-01), Spears
patent: 2765033 (1956-10-01), Uhr
patent: 2948404 (1960-08-01), Harrod
patent: 3103099 (1963-09-01), Hanks
patent: 3125849 (1961-04-01), Wachtel
patent: 3438197 (1969-04-01), Roer
patent: 4340947 (1982-07-01), Barton
patent: 4408894 (1983-10-01), Hemperly
patent: 4431313 (1984-02-01), Hemperly

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