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1. WO1979000019 - APPARATUS FOR METERING OR DISTRIBUTING THE VOLUME OF LIQUIDS

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Claims

1. Apparatus for metering liquids into an ungraduated dosage vessel having bottom and side walls defining .an upper mouth at least a portion of one side wall being substatially vertical and transparent,
characterized in that the vertical transparent portion of the dosage vessel is arranged for coaction with a graduated scale, placed outside said portion, said scale being separated from the outside of the dosage vessel portion by an air gap whereby light rays from the scale graduations pass through the interface at the inner surface of the vessel when the vessel is empty, so that the graduations are visible from the mouth of the vessel, whereas said rays are totally internally reflected at the interface between the inner surface of the vessel wall and the liquid when the vessel is filled with liquid - of course having greater refraction index than air - the graduation mark thus being no longer visible from the mouth of the vessel.

2. Apparatus as claimed in claim 1,
characterized in that the graduation scale is applied on an outer vessel enclosing the dosage vessel.

3. Apparatus as claimed in claim 2 or 3,
characterized in that the dosage vessel and the outer vessel both are formed with tapered side walls.

4, Apparatus as claimed in claim 2 or 3
characterized in that the graduations are applied on the inner surface of the outer vessel side wall.

5. Apparatus as claimed in claim 2 or 3,
characterized in that the outer vessel is transparent and that the graduation scale is applied on the outer surface of the outer vessel side wall.

AMENDED CLAIMS
(received by the International Bureau on 27 November 1978 (27.11.78))

1. Apparatus for metering liquids into an ungraduated dosage vessel having bottom and side walls defining an upper mouth, at least a portion of one side wall being substantially vertical and transparent, c h a r a c t e r i z e d in that the vertical transparent portion of the dosage vessel is arranged for coaction with a graduated scale, placed outside said portion, said scale facing the dosage vessel and being separated from the outside of the dosage vessel portion by an air gap whereby light rays from the scale graduations pass through the interface at the inner surface of the vessel when the vessel is empty, so that the graduations are visible from above the mouth of the vessel, whereas said rays are totally internally reflected at the interface between the inner surface of the vessel wall and the liquid when the vessel is filled with liquid - of course having greatecrrrefraction index than air - the graduation mark thus being no longer visible from the mouth of the vessel.

2. Apparatus as claimed in claim 1,
characterized in that the graduation scale is applied on an outer vessel enclosing the dosage vessel.

3. Apparatus as claimed in claim 2 or 3,
characterized in that the dosage vessel and the outer vessel both are formed with tapered side walls.

4. Apparatus as claimed in claim 2 or 3,
characterized in that the graduations are applied on the inner surface of the outer vessel side wall.

5. Apparatus as claimed in claim 2 or 3.
characterized in that the outer vessel is transparent and that the graduation scale is applied on the outer surface of the outer vessel side wall.

STATEMENT UNDER ARTICLE 19

Claim 1 has been amended by inserting the words "facing the dosage vessel" after the words "said scale" in claim 1, line 6 and inserting "above" at the end of line 9 after "from". By these small amendments the invention has been described more clearly and delimited from all the documents cited in the International Search Report mailed 1978-10-03.