US3769895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masking for printed circuit photomasters
Assignee: AT&T Teletype Corp
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Filing: 1971-06-09
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Granted: 1973-11-06
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Expires: 1991-06-09
Abstract
Abstract A pad to represent a land area on a photomaster for printed circuit patterns has a set of orthogonal indicators to locate the pad with respect to an underlying rectangular grid pattern. The pad also has a center mark to facilitate referencing to the center of the pad for programming drills or the like once the pad has been incorporated into the pattern of the photomaster.
Inventors
- 👤 G Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:40
CPC Classifications
G; G03; G03F; G03F9/00; G03F9/70; G03F9/7073; G03F9/7076
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
177 words
An element for attachment to an art master base sheEt having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, the means for defining the reference point on the pad being an aperture through the pad having a size substantially precluding the passage of light in the opaque area of the mask delineated by the element on the art master, and each set of indicators being a pair of discernible straight lines on the pad, each line extending from the aperture to the periphery of the pad; and means for attaching the pad to the base sheet to form an art master.
Claim 2
Dependent Claim
177 words
An element for attachment to an art master base sheEt having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, the means for defining the reference point on the pad being an aperture through the pad having a size substantially precluding the passage of light in the opaque area of the mask delineated by the element on the art master, and each set of indicators being a pair of discernible straight lines on the pad, each line extending from the aperture to the periphery of the pad; and means for attaching the pad to the base sheet to form an art master.
Claim 3
Dependent Claim
17 words
An element as defined in claim 1, wherein each pair of visible lines is a scribe line.
Claim 4
Dependent Claim
151 words
An element for attachment to an art master base sheet having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, each indicator being a discernible straight line on the pad extending from the periphery of the pad toward a common junction on the pad, and the means for defining the reference point of the pad being the junction of the lines; and means for attaching the pad to the base sheet to form an art master.
Claim 5
Dependent Claim
151 words
An element for attachment to an art master base sheet having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, each indicator being a discernible straight line on the pad extending from the periphery of the pad toward a common junction on the pad, and the means for defining the reference point of the pad being the junction of the lines; and means for attaching the pad to the base sheet to form an art master.
Claim 6
Dependent Claim
140 words
An element for attachment to an art master base sheet having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, the means for defining the reference point on the pad being a rectangular aperture through the pad, and each set of indicators consisting of the opposite corners of the aperture; and means for attaching the pad to the base sheet to form an art master.
Claim 7
Dependent Claim
140 words
An element for attachment to an art master base sheet having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, the means for defining the reference point on the pad being a rectangular aperture through the pad, and each set of indicators consisting of the opposite corners of the aperture; and means for attaching the pad to the base sheet to form an art master.
Claim 8
Dependent Claim
32 words
An element as defined in claim 4 where there is a window mounted in the aperture which is transparent to one color of light and opaque to all other colors of light.
Claim 9
Dependent Claim
122 words
An element for attachment to an art master base sheet having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, each indicator being a V-shaped modification of the periphery of the pad; and means for attaching the pad to the base sheet to form an art master.
Claim 10
Dependent Claim
122 words
An element for attachment to an art master base sheet having orthogonal grid lines for locating the element, which comprises: an opaque pad having means for defining a reference point on the pad, said defining means being incapable of passing significant quantities of illumination, and having two sets of indicators, each set of indicators being located at ends of a line through the reference point on the pad, and the location line of each set being orthogonal to the line of the other set, for aligning the pad with respect to the orthogonal grid lines, each indicator being a V-shaped modification of the periphery of the pad; and means for attaching the pad to the base sheet to form an art master.
Claim 11
Dependent Claim
25 words
An element as defined in claim 6 wherein the means for defining the reference point on the pad comprises a small aperture through the pad.
Claim 12
Dependent Claim
22 words
An element as defined in claim 6 wherein the apex of eachV-shaped indicator is pointed toward the reference point on the pad.
Claim 13
Dependent Claim
24 words
An element as defined in claim 6 wherein the apex of each V-shaped indicator is pointed away from the reference point on the pad.
References Cited (Backward Citations)
US2970043A
Cited
US3233509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |