Patent US3657983A successfully refreshed from Google Patents.
US3657983A
Expired / Lapsed
US
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Graphic aid and methods related thereto
Assignee: Fotel Inc
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Filing: 1970-05-13
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Granted: 1972-04-25
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Expires: 1990-05-13
Abstract
Abstract A master grid layout sheet and methods of manufacture associated therewith are disclosed for use in graphic art work such as the layout and reproduction of printed circuits and the like. In typical printed circuit work precision art work and subsequent photographic reproduction thereof are normal intermediate processing steps. The master sheet includes a pattern, usually of orthogonal reference lines, printed thereon in a predetermined critical gray or neutral monotone. The monotone has a visual density such that the reference line pattern is visible to a draftsman but the light transmission density or opacity thereof is insufficient to cause the pattern to be reproduced in a controlled photographic reproduction of the master sheet. A processing control method for forming the master grid sheet is also disclosed. The process utilizes a visual process control guide which provides a standard of comparison for obtaining the critical transmission density of the gray monotone pattern. Thus the development process by which the master grid sheet is formed may be consistently controlled to produce the critical transmission density for the reference pattern thereon. The subsequent processing of reproductions of the art work may be controlled in correlation with the critical density of the monotone pattern to cause the pattern to disappear in the final product.
Inventors
- 👤 Elton N Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:56
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/90; H; H05; H05K; H05K3/00; H05K3/0002; H05K2201/00; H05K2201/09; H05K2201/09818; H05K2201/09936; H05K2203/00; H05K2203/05; H05K2203/0548; H05K2203/056
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
162 words
A layout sheet having disposed thereon a master reference pattern for use in the preparation of photographic reproductions of effectively opaque effects on said sheet and oriented with respect to said master reference pattern, the effects including a plurality of oriented effectively opaque areas, said sheet comprising a generally planar member having low optical density and a master reference pattern thereon comprising neutral monotone effects disposed on a surface of said planar member, the neUtral monotone effects being disposed on said surface in a pattern to facilitate the location of said effectively opaque areas, said neutral monotone effects having an optical density sufficient to be visible during the location of said effectively opaque areas but having sufficiently low optical density that sufficient light impinging thereon can be utilized in subsequent photographic reproduction to render said neutral monotone effects photographically invisible, the optical density of said neutral monotone effects being no more than about 0.4 above the optical density of said planar member.
Claim 2
Dependent Claim
162 words
A layout sheet having disposed thereon a master reference pattern for use in the preparation of photographic reproductions of effectively opaque effects on said sheet and oriented with respect to said master reference pattern, the effects including a plurality of oriented effectively opaque areas, said sheet comprising a generally planar member having low optical density and a master reference pattern thereon comprising neutral monotone effects disposed on a surface of said planar member, the neUtral monotone effects being disposed on said surface in a pattern to facilitate the location of said effectively opaque areas, said neutral monotone effects having an optical density sufficient to be visible during the location of said effectively opaque areas but having sufficiently low optical density that sufficient light impinging thereon can be utilized in subsequent photographic reproduction to render said neutral monotone effects photographically invisible, the optical density of said neutral monotone effects being no more than about 0.4 above the optical density of said planar member.
Claim 3
Dependent Claim
15 words
The layout sheet of claim 1 wherein said planar member is a diaphanous flexible sheet.
Claim 4
Dependent Claim
19 words
The layout sheet of claim 1 wherein said monotone effects and said opaque areas are of the same color.
Claim 5
Dependent Claim
33 words
The layout sheet of claim 3 wherein the neutral monotone effects have light transmission densities within the range of about 0.2 to about 0.4 above the light transmission density of said planar member.
Claim 6
Dependent Claim
37 words
The layout sheet of claim 4 including opaque areas having substantially the same color as neutral monotone effects and having light transmission densities of at least about 3.0 above the light transmission density of said planar member.
Claim 7
Dependent Claim
18 words
The layout sheet of claim 3 wherein the light transmission density of said planar member is substantially zero.
Claim 8
Dependent Claim
17 words
The layout sheet of claim 6 wherein the density of said neutral monotone effects is about 0.3.
Claim 9
Dependent Claim
174 words
A layout sheet having disposed thereon a master reference pattern for use in the preparation of photographic reproductions of effectively opaque effects on said sheet and oriented with respect to said master reference pattern, the effects including a plurality of oriented effectively opaque areas, said sheet comprising a generally planar member having low optical density and a master reference pattern thereon comprising neutral monotone effects disposed on a surface of said planar member, the neutral monotone effects being disposed on said surface in a pattern to facilitate the location of said effectively opaque areas, said neutral monotone effects having an optical density sufficient to be visible during the location of said effectively opaque areas but having sufficiently low optical density that sufficient light impinging thereon can be utilized in subsequent photographic reproduction to render said neutral monotone effects photographically invisible, said generally planar member comprising a sheet of supporting film for a photographic emulsion, said neutral monotone effects constituting a pattern of photographic emulsion disposed on said film and reduced to a visible state.
Claim 10
Dependent Claim
174 words
A layout sheet having disposed thereon a master reference pattern for use in the preparation of photographic reproductions of effectively opaque effects on said sheet and oriented with respect to said master reference pattern, the effects including a plurality of oriented effectively opaque areas, said sheet comprising a generally planar member having low optical density and a master reference pattern thereon comprising neutral monotone effects disposed on a surface of said planar member, the neutral monotone effects being disposed on said surface in a pattern to facilitate the location of said effectively opaque areas, said neutral monotone effects having an optical density sufficient to be visible during the location of said effectively opaque areas but having sufficiently low optical density that sufficient light impinging thereon can be utilized in subsequent photographic reproduction to render said neutral monotone effects photographically invisible, said generally planar member comprising a sheet of supporting film for a photographic emulsion, said neutral monotone effects constituting a pattern of photographic emulsion disposed on said film and reduced to a visible state.
Claim 11
Dependent Claim
33 words
The layout sheet of claim 8 wherein the neutral monotone effects have light transmission densities within the range of about 0.2 to about 0.4 above the light transmission density of said planar member.
Claim 12
Dependent Claim
26 words
The layout sheet of claim 8 wherein at least some of said effectively opaque areas are areas of said photographic emulsion reduced to a visible state.
Claim 13
Dependent Claim
21 words
The layout sheet of claim 8 wherein at least some of said effectively opaque areas are adhesively secured to said film.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |