Patent US3789329A successfully refreshed from Google Patents.
Patent US4149187A successfully refreshed from Google Patents.
US4149187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing plate inspection apparatus
Assignee: John Fairfax and Sons Ltd
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Filing: 1977-07-05
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Granted: 1979-04-10
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Expires: 1997-07-05
Abstract
Abstract A printing plate inspection apparatus for inspecting the dot profile of photo-engraved printing plates having a length of opaque material having a straight edge which is placed adjacent the surface to be inspected with a light source to light the surface on one side of the straight edge, and a viewing device on the other side of the straight edge to receive the light reflected from the surface under the straight edge to determine the dot profile.
Inventors
- 👤 Archibald E. Palmer
- 👤 Raymond G. Macquart
- 👤 Risto T. T. Karaiste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:35
CPC Classifications
B; B41; B41N; B41N3/00; G; G01; G01B; G01B11/00; G01B11/02; G01B11/022; G01B11/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
Printing plate inspection apparatus comprising a length of opaque material having a straight edge which is adapted to be placed adjacent the surface to be inspected, a light source adapted to light the surface on one side of the straight edge, and a viewing device disposed on the side of the straight edge and adapted to receive source light reflected from the surface under the straight edge.
Claim 2
Dependent Claim
67 words
Printing plate inspection apparatus comprising a length of opaque material having a straight edge which is adapted to be placed adjacent the surface to be inspected, a light source adapted to light the surface on one side of the straight edge, and a viewing device disposed on the side of the straight edge and adapted to receive source light reflected from the surface under the straight edge.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1 wherein said viewing device comprises a microscope whose focal point is located on the surface being inspected beneath the straight edge.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 1 wherein said viewing device is connected to a video camera so that the image of the portion of the surface inspected can then be directed to appear on a television monitor.
Claim 5
Dependent Claim
37 words
Apparatus in accordance with claim 2 wherein said viewing device is connected to a video camera so that the image of the portion of the surface inspected can then be directed to appear on a television monitor.
Claim 6
Dependent Claim
67 words
Apparatus in accordance with claim 1 wherein said viewing device comprises a microscope whose focal point is located on the surface being inspected beneath the straight edge, said viewing device being connected to a video camera so that the image of the portion of the surface inspected can then be directed to appear on a television monitor, means supporting said viewing device for horizontal and vertical movement.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |