Patent US3690771A successfully refreshed from Google Patents.
US3690771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for instrumentally shading metallic paints
Assignee: EIDP Inc
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Filing: 1970-04-07
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Granted: 1972-09-12
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Expires: 1990-04-07
Abstract
Abstract A system which can be used in the paint manufacturing industry to shade batches of paint to desired standard color based on standard values for the standard color by use of physical differences of the paint to be shaded and the standard paint determined from tristimulus values derived from panels sprayed with the respective paints.
Inventors
- 👤 William S Armstrong Jr
- 👤 Webster H Edwards
- 👤 Joseph P Laird
- 👤 Roy H Vining
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:26
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/463; G01J3/465; G01J3/50; G01J3/504; G01J2003/466
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
An apparatus for instrumEntally shading colors according to a standard color in the manufacture of paints containing light reflecting particles comprising A. means for determining color constants (vector data) by use of spectral curves at multi angles on a test panel coated with a standard paint; B. means for determining differences at multi angles between the standard paint and a non-standard paint by use of tristimulus values; and, C. means for correlating differences of (B) with the color constants of (A) and calculating proper amounts of specific pigments which should be added to the non-standard paint to obtain a color match.
Claim 2
Independent Claim
101 words
An apparatus for instrumEntally shading colors according to a standard color in the manufacture of paints containing light reflecting particles comprising A. means for determining color constants (vector data) by use of spectral curves at multi angles on a test panel coated with a standard paint; B. means for determining differences at multi angles between the standard paint and a non-standard paint by use of tristimulus values; and, C. means for correlating differences of (B) with the color constants of (A) and calculating proper amounts of specific pigments which should be added to the non-standard paint to obtain a color match.
Claim 3
Dependent Claim
257 words
The apparatus of claim 1 wherein A. the means for determining color constants (vector data) by use of spectral curves on a test panel coated with a standard paint is a spectrophotometer modified in order that multi-angular measurements can be made; B. the means for determining color differences between the stand and a non-standard paint by use of tristimulus values is a colorimeter modified in order that multi-angular measurements can be made; and, C. the means for correlating the differences of (B) with the color constants of (A) and calculating proper amounts of specific pigments which should be added to the non-standard paint to obtain a color match is a computer specially programmed to resolve the equations: - Delta LF NcF1 Delta LF1 + NcF2 Delta LF2 + NcF3 Delta LF3 + . . . + NcFN Delta LFN - Delta aF NcF1 Delta aF1 + NcF2 Delta cF2 + NcF3 Delta aF3 + . . . + NcFN Delta aFN - Delta bF NcF2 Delta bF1 + NcF2 Delta bF2 + NcF3 Delta bF3 + . . . + NcFN Delta bFN - Delta LH NcH1 Delta LH1 + NcH2 Delta LH2 + NcH3 Delta LH3 + . . . + NcHN Delta LHN - Delta aH NcH1 Delta aH1 + NcH2 Delta cH2 + NcH3 Delta aH3 + . . . + NcHN Delta aHN - Delta bH NcH1 Delta bH1 + NcH2 Delta bH2 + NcH3 Delta bH3 + . . . + NcHN Delta bHN where F and H represents two different angles.
Claim 4
Independent Claim
101 words
A method of instrumentally color shading paints containing light reflecting metal flakes comprising A. deriving color constants (vector data) for a test panel coated with standard paint by multiangular spectrophotometric determinations; B. determining differences between the test panel and a panel similarly coated with paint from a batch which is to be shaded by obtaining tristimulus values using a colorimeter at the same angles as the aforementioned spectrophotometric determinations; and C. correlating the aforementioned differences and color constants and calculating amounts of specific pigment which should be added to the non-standardized batch to produce a color match with the standard paint.
Claim 5
Independent Claim
101 words
A method of instrumentally color shading paints containing light reflecting metal flakes comprising A. deriving color constants (vector data) for a test panel coated with standard paint by multiangular spectrophotometric determinations; B. determining differences between the test panel and a panel similarly coated with paint from a batch which is to be shaded by obtaining tristimulus values using a colorimeter at the same angles as the aforementioned spectrophotometric determinations; and C. correlating the aforementioned differences and color constants and calculating amounts of specific pigment which should be added to the non-standardized batch to produce a color match with the standard paint.
Claim 6
Dependent Claim
49 words
The method of claim 3 wherein the standard and non-standard paints contain metallics and the color constants (vector data) for the standard paint are determined by multi-angular spectrophotometric measurements on panels coated individually with each pigment contained in the standard paint and a panel coated with only metal flake.
Claim 7
Dependent Claim
36 words
The method of claim 4 wherein the multi-angular measurements are limited to two angles which differ from each other by from 60* to 80*, said same angles being used for measurement by the spectrophotometer and colorimeteR.
Claim 8
Dependent Claim
177 words
The method of claim 3 wherein a computer is used for correlating differences between the standard and non-standard paint and calculating amounts of pigment to be added to obtain a color match, said computer programmed to handle the equations: -Delta LF NcF1 Delta LF1 + NcF2 Delta LF2 + NcF3 Delta LF3 + . . . + NcFN Delta LFN - Delta aF NcF1 Delta aF1 + NcF2 Delta cF2 + NcF3 Delta aF3 + . . . + NcFN Delta aFN - Delta bF NcF2 Delta bF1 + NcF2 Delta hF2 + NcF3 Delta bF3 + . . . + NcFN Delta bFN -Delta LH NcH1 Delta LH1 + NcH2 Delta LH2 + NcH3 Delta LH3 + . . . + NcHN Delta LHN - Delta aH NcH1 Delta aH1 + NcH2 Delta cH2 + NcH3 Delta aH3 + . . . + NcHN Delta aHN - Delta bH NcH1 Delta bH1 + NcH2 Delta bH2 + NcH3 Delta bH3 + . . . + NcHN Delta bHN where F and H represent two different angles.
References Cited (Backward Citations)
US3506365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |