US4582425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for preparing colorimeter sample
Assignee: 3M Co
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Filing: 1984-08-03
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Granted: 1986-04-15
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Expires: 2004-08-03
Abstract
Abstract The novel device prepares samples of loose particles such as roofing granules to present a level surface from which colorimeter measurements can be made. The particles to be measured overfill a dish, the lip of which has a bevel providing a knife edge at its inner diameter. A roller is rolled back and forth across the dish to push excess particles beyond the knife edge from which they fall through a grid on which the dish rests.
Inventors
- 👤 Bruce A. Rabine
- 👤 Steven M. Stensvad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:21
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
Device for arranging a mass of loose particles to present a uniformly level surface, thus enabling the color of the particles to be reproducibly measured, said device comprising a dish having an annular lip which has a bevel providing a knife edge at the inner diameter of the lip, and a base comprising a cylindrical roller, the axial width of which exceeds the diameter of the lip of the dish, a carriage for moving the roller horizontially in a direction transversely to its axis, a dish support for holding the dish rigidly in the direction of roller travel, and said carriage including means for moving the roller to roll completely across the knife edge of the dish so that when the dish has been overfilled with loose particles, a level particle surface results.
Claim 2
Dependent Claim
133 words
Device for arranging a mass of loose particles to present a uniformly level surface, thus enabling the color of the particles to be reproducibly measured, said device comprising a dish having an annular lip which has a bevel providing a knife edge at the inner diameter of the lip, and a base comprising a cylindrical roller, the axial width of which exceeds the diameter of the lip of the dish, a carriage for moving the roller horizontially in a direction transversely to its axis, a dish support for holding the dish rigidly in the direction of roller travel, and said carriage including means for moving the roller to roll completely across the knife edge of the dish so that when the dish has been overfilled with loose particles, a level particle surface results.
Claim 3
Dependent Claim
40 words
Device as defined in claim 1 wherein the carriage comprises two parallel shafts held in cantilever fashion by a yoke which pivots at the base to allow the carriage to be raised for unobstructed positioning and removal of the dish.
Claim 4
Dependent Claim
29 words
Device as defined in claim 2 including means for adjusting the position of the roller to contact the bevel of the dish when moved downwardly to the working position.
Claim 5
Dependent Claim
32 words
Device as defined in claim 1 wherein the bevel of the lip of the dish is between 20° and 50° to the horizontal when the dish is positioned on the dish support.
Claim 6
Dependent Claim
35 words
Device as defined in claim 4 wherein the depth of the dish is at least twice the maximum diameter of an average particle and greater than the maximum diameter of every particle to be tested.
Claim 7
Dependent Claim
24 words
Device as defined in claim 1 wherein each of the dish and roller is steel having a Rockwell C hardness from 53 to 58.
Claim 8
Dependent Claim
34 words
Device as defined in claim 1 wherein the dish support includes a central rail extending in the direction of roller travel, and the underside of the dish is formed to fit on that rail.
Claim 9
Dependent Claim
35 words
Device as defined in claim 7 wherein said central rail has a knife edge, and the underside of the dish is formed with a V-shaped channel, the apex of which rests on the knife edge.
Claim 10
Dependent Claim
40 words
Device and defined in claim 8 wherein the angle of said channel slightly exceeds that of the rail's knife edge to allow the dish to pivot transversely while the knife edge and the V of the channel remain in contact.
Claim 11
Dependent Claim
17 words
Device as defined in claim 9 wherein the angle of the rail's knife edge is about 90°.
Claim 12
Dependent Claim
40 words
Device as defined in claim 10 wherein the dish support includes a locator rod extending transversely to the rail, and the underside of the dish does not contact the locator rod when the lip of the dish is precisely horizontal.
References Cited (Backward Citations)
US3232711A
Cited
US3614230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |