US4073623A
Expired / Lapsed
US
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Analytical determination of substances in solution
Assignee: Merck Patent GmbH
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Filing: 1976-10-20
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Granted: 1978-02-14
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Expires: 1996-10-20
Abstract
Abstract A device for supporting sample-containing tubes in generally vertical parallel adjacency, one of the tubes containing an unknown sample and the other containing a reference or comparison sample, with the bottoms of the tubes located in predetermined relationship with a color table or chart having colored or shaded portions preselected and calibrated in accordance with the particular comparison to be made, the table or chart being movable at a right angle relative to the tubes such as to provide visual comparison between the samples based on color or optical density.
Inventors
- 👤 Detlef E. Bodart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/29; G01N21/293
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
A device for the analytical determination of substances in solution by color development of a sample solution and then comparison thereof with a comparison solution in tubes; and comprising a block formation with at least two tube-shaped openings in generally side-by-side adjacency passing therethrough for reception of solution-containing tubes; means providing a slot along the block traversing the ends of said openings for receiving color tables movable at a right angle relative to the openings.
Claim 2
Independent Claim
75 words
A device for the analytical determination of substances in solution by color development of a sample solution and then comparison thereof with a comparison solution in tubes; and comprising a block formation with at least two tube-shaped openings in generally side-by-side adjacency passing therethrough for reception of solution-containing tubes; means providing a slot along the block traversing the ends of said openings for receiving color tables movable at a right angle relative to the openings.
Claim 3
Dependent Claim
26 words
A device according to claim 1, in combination with tubes disposed in the openings and having substantially flat bottoms disposed in close adjacency to the slot.
Claim 4
Dependent Claim
18 words
A device according to claim 1, in combination with a color table disposed for movement along the slot.
Claim 5
Dependent Claim
34 words
A device according to claim 1, wherein the openings are arranged substantially vertically in the block and the slot is along a lower portion of the block and defined by depending parallel side pieces.
Claim 6
Dependent Claim
17 words
A device according to claim 4, wherein the block is substantially opaque to eliminate extraneous lateral light.
Claim 7
Dependent Claim
38 words
A device according to claim 3, in combination with tubes disposed in the openings and having rounded bottoms acting as convex lenses disposed above the color table, a distance not greater than the focal length of the lenses.
Claim 8
Dependent Claim
34 words
A device as claimed in claim 6, wherein the block is provided with a portion overhanging the color table and in which the tubes are located at the said distance above the color table.
References Cited (Backward Citations)
US3520626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |