US3832070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calibration system for reflection densitometers
Assignee: COSAR CORP
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Filing: 1973-04-27
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Granted: 1974-08-27
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Expires: 1993-04-27
Abstract
Abstract In a reflection densitometer calibration system, a calibration standard comprises a paper sheet having color zones printed thereon, including the colors white, black, and shades of blue, red and yellow. The paper sheet is laminated between two transparent plastic sheets which enclose the paper sheet and form a protective covering over the color zones. Strips of a transparent writing accepting material are then secured to the outer surface of the plastic layer which overlies the color zones. After the calibration standard is fabricated, the optical densities of the color zones are determined by means of a master reflection densitometer. An indication of the optical density of each color zone is then written on the portion of the writing accepting strip adjacent the color zone. The calibration standard is then ready for use in calibrating reflection densitometers.
Inventors
- 👤 J Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:25
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/52; B; B41; B41P; B41P2233/00; B41P2233/50; B41P2233/51
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
105 words
A reflection densitometer calibration process comprising: forming a plurality of zones of different color on a sheet; covering at least the color zones of the sheet with a transparent protective layer; determining the optical density of each of the color zones by means of a master reflection densitometer; writing an indication of the optical density of each zone in an area adjacent the zone; checking the optical density of each zone with a second reflection densitometer; and adjusting the operation of the second reflection densitometer such that the optical density indication provided thereby for each zone matches the written optical density indication of the zone.
Claim 2
Dependent Claim
105 words
A reflection densitometer calibration process comprising: forming a plurality of zones of different color on a sheet; covering at least the color zones of the sheet with a transparent protective layer; determining the optical density of each of the color zones by means of a master reflection densitometer; writing an indication of the optical density of each zone in an area adjacent the zone; checking the optical density of each zone with a second reflection densitometer; and adjusting the operation of the second reflection densitometer such that the optical density indication provided thereby for each zone matches the written optical density indication of the zone.
Claim 3
Dependent Claim
30 words
The reflection densitometer calibration process according to claim 1 further characterized by: printing the color zones on a paper layer; and laminating the paper layer between two transparent plastic layers.
Claim 4
Dependent Claim
41 words
The reflection densitometer calibration process according to claim 2 further characterized by: forming a writing receiving zone on at least one of the plastic layers; and writing the indication of optical density for each color zone on the writing receiving zone.
Claim 5
Dependent Claim
40 words
The reflection densitometer calibration process according to claim 3 wherein the step of forming a writing receiving zone is carried out by securing at least one strip of transparent writing receiving material to the outer surface of the transparent layer.
Claim 6
Dependent Claim
140 words
A reflection densitometer calibration process comprising: printing at least one side of a substantially opaque layer to provide a plurality of zones each comprising a different color; covering at least the printed side of the opaque layer with a substantially transparent protective layer; forming at least one writing accepting zone on the transparent layer overlying the color zones on the opaque layer; determining the optical density of each of the color zones; writing an indication of the optical density of each zone in the writing accepting zone; analyzing each color zone by means of a reflection densitometer to provide an output indicative of the optical density of the zone; and adjusting the operating parameters of the reflection densitometer so that the optical density output generated thereby for each color zone matches the written optical density indication relating to that zone.
Claim 7
Dependent Claim
140 words
A reflection densitometer calibration process comprising: printing at least one side of a substantially opaque layer to provide a plurality of zones each comprising a different color; covering at least the printed side of the opaque layer with a substantially transparent protective layer; forming at least one writing accepting zone on the transparent layer overlying the color zones on the opaque layer; determining the optical density of each of the color zones; writing an indication of the optical density of each zone in the writing accepting zone; analyzing each color zone by means of a reflection densitometer to provide an output indicative of the optical density of the zone; and adjusting the operating parameters of the reflection densitometer so that the optical density output generated thereby for each color zone matches the written optical density indication relating to that zone.
Claim 8
Dependent Claim
47 words
The reflection densitometer calibration process according to claim 5 further characterized by printing a substantially white zone, a substantially black zone, a zone comprising a shade of blue, a zone comprising a shade of red, and a zone comprising a shade of yellow on the opaque layer.
Claim 9
Dependent Claim
40 words
The reflection densitometer calibration process according to claim 5 further characterized by: printing the color zones and means designating a writing receiving area corresponding to each zone on a paper sheet; and laminating the paper sheet between two plastic sheets.
Claim 10
Dependent Claim
36 words
The reflection densitometer calibration process according to claim 7 wherein the writing accepting zones are formed by applying strips of a writing accepting material to the plastic sheet on the printed side of the paper sheet.
Claim 11
Dependent Claim
97 words
A reflection densitometer calibration apparatus comprising: a substantially opaque sheet having formed thereon a plurality of color zones; each of said color zones comprising a substantially different color from the remainder of the color zones; means forming a transparent protective layer extending over at least the portions of the opaque sheet having the color zones formed thereon; and means forming a writing receiving zone on the exterior of the apparatus for receiving a written indication of the optical density of each color zone and thereby facilitating the use of the apparatus in the calibration of reflection densitometers.
Claim 12
Dependent Claim
97 words
A reflection densitometer calibration apparatus comprising: a substantially opaque sheet having formed thereon a plurality of color zones; each of said color zones comprising a substantially different color from the remainder of the color zones; means forming a transparent protective layer extending over at least the portions of the opaque sheet having the color zones formed thereon; and means forming a writing receiving zone on the exterior of the apparatus for receiving a written indication of the optical density of each color zone and thereby facilitating the use of the apparatus in the calibration of reflection densitometers.
Claim 13
Dependent Claim
28 words
The reflection densitometer calibration apparatus according to claim 9 wherein the transparent sheet comprises a paper layer, and wherein the color zones are printed on the paper layer.
Claim 14
Dependent Claim
31 words
The reflection densitometer calibration apparatus according to claim 10 wherein the protective means comprises a pair of transparent plastic layers extending on the opposite sides of and enclosing the paper layer.
Claim 15
Dependent Claim
33 words
The reflection densitometer calibration apparatus according to claim 10 wherein the writing receiving means is formed on the outside of the transparent plastic layer extending adjacent the color zones on the paper layer.
Claim 16
Dependent Claim
31 words
The reflection densitometer calibration apparatus according to claim 12 wherein the writing receiving means comprises a substantially transparent writing receiving layer secured to the outside surface of the transparent plastic layer.
Claim 17
Dependent Claim
136 words
A reflection densitometer calibration apparatus comprising: a paper layer having printed thereon a plurality of color zones adapted for the calibration of reflection densitometers; each of said color zones comprising a substantially different color from the remainder of the color zones; a pair of plastic layers extending adjacent the opposite sides of the paper sheet and entirely enclosing the paper sheet for the protection of the color zones thereon; at least the portion of the plastic layer overlying the color zones being transparent; and means forming a writing receiving zone on at least a portion of the outside surface of at least one of the plastic layers for receiving written indications of the optical densities of the color zones on the paper layer and thereby facilitating use of the apparatus in the calibration of reflection densitometers.
Claim 18
Dependent Claim
136 words
A reflection densitometer calibration apparatus comprising: a paper layer having printed thereon a plurality of color zones adapted for the calibration of reflection densitometers; each of said color zones comprising a substantially different color from the remainder of the color zones; a pair of plastic layers extending adjacent the opposite sides of the paper sheet and entirely enclosing the paper sheet for the protection of the color zones thereon; at least the portion of the plastic layer overlying the color zones being transparent; and means forming a writing receiving zone on at least a portion of the outside surface of at least one of the plastic layers for receiving written indications of the optical densities of the color zones on the paper layer and thereby facilitating use of the apparatus in the calibration of reflection densitometers.
Claim 19
Dependent Claim
38 words
The reflection densitometer calibration apparatus according to claim 14 wherein the paper layer further comprises means designating an area immediately adjacent each color zone for receiving a written designation of the optical density of the adjacent color zone.
Claim 20
Dependent Claim
31 words
The reflection densitometer calibration apparatus according to claim 15 wherein the writing receiving zone on the outer surface of the plastic layer overlies the writing receiving areas of the paper layer.
Claim 21
Dependent Claim
35 words
The reflection densitometer calibration apparatus according to claim 16 wherein the means forming the writing receiving zone comprises a strip of substantially transparent writing receiving material secured to the outer surface of the plastic layer.
Claim 22
Dependent Claim
25 words
The reflection densitometer calibration apparatus according to claim 14 wherein the colors of the zones include: white, black and shades of blue, red and yellow.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |