Tubular writing instrument with suction vent

Details Tubular writing instrument with suction vent Tubular writing instrument with suction vent

1992-10-19

1993-05-18

Bratlie, Steven A.

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

401195, 401224, 401258, 401276, B43K 708, B43K 500

Patent

active

052114953

ABSTRACT:
A writing or drawing instrument wherein a housing (1), is provided with a writing point (2) and a writing fluid reservoir (3) within an interior space of the housing. A capillary pressure equalization system (5), that connects the reservoir with the ambient air, has a sensor (7) therein for reacting to the level of writing fluid (4) therein. A suction pump (11, 12) is connected with the writing fluid reservoir (3) through a semi-permeable membrane (10) which lets air through and is impermeable for writing fluid (4). The suction pump (11, 12) is activated by the sensor (7) in response to a level of writing fluid (4) in the pressure equalization system, and aspirates air from the reservoir so as to quickly reduce an overpressure condition.

REFERENCES:
patent: 4350458 (1982-09-01), Murahara et al.
patent: 4573819 (1986-03-01), Herrnring

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