Patent US3581660A successfully refreshed from Google Patents.
US3581660A
Expired / Lapsed
US
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Lithographic printing process
Assignee: Rapoport Printing Corp
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Filing: 1968-12-18
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Granted: 1971-06-01
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Expires: 1988-12-18
Abstract
Abstract A method for producing lithographic reproductions having outstanding tonal fidelity is disclosed. The new method includes the making of master and secondary printing plates from photographic images of the original copy and sequentially and in registry printing with each printing plate. Both printing plates are formed by photoengraving techniques from separate photographic negatives, each obtained by photographically exposing the original copy through a screen having an image disrupting surface pattern. The screen utilized in producing the master printing plate is a conventional square grid halftone screen, while that used in making the secondary negative has a fine irregular surface pattern.
Inventors
- 👤 Sidney L Rapoport
- 👤 Douglas F Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:50
CPC Classifications
G; G03; G03F; G03F5/00; G03F5/14; B; B41; B41M; B41M1/00; B41M1/06; G03F5/22; G03F5/24
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
141 words
A method for the lithographic reproduction of original copy, comprising a. forming a master halftone printing plate from a master photographic image of said original copy, b. said master photographic image being formed by exposing a first photographic film surface to said original copy through a square grid halftone screen, c. forming a secondary printing plate from a secondary photographic image of said original copy, d. said secondary photographic image being made by overexposing, relative to the exposure of said first photographic film surface, a second photographic film surface to said original copy through a random pattern screen, e. printing a paper substrate with said master printing plate, and f. printing sad paper substrate with said secondary printing plate, g. the printing steps of paragraphs (e) and (f) being performed in registry to produce a single reproduction of said original copy.
Claim 2
Independent Claim
141 words
A method for the lithographic reproduction of original copy, comprising a. forming a master halftone printing plate from a master photographic image of said original copy, b. said master photographic image being formed by exposing a first photographic film surface to said original copy through a square grid halftone screen, c. forming a secondary printing plate from a secondary photographic image of said original copy, d. said secondary photographic image being made by overexposing, relative to the exposure of said first photographic film surface, a second photographic film surface to said original copy through a random pattern screen, e. printing a paper substrate with said master printing plate, and f. printing sad paper substrate with said secondary printing plate, g. the printing steps of paragraphs (e) and (f) being performed in registry to produce a single reproduction of said original copy.
Claim 3
Dependent Claim
27 words
The method of claim 1, further including the step of a. increasing the speed and sensitivity of said second photographic film before exposure to said original copy.
Claim 4
Dependent Claim
22 words
The method of claim 2, wherein a. the speed and sensitivity of said second photographic film is increased by exposure to light.
Claim 5
Independent Claim
157 words
A method for the lithographic reproduction of original copy comprising a. exposing a first photographically sensitive surface to said original copy through a halftone screen for a first predetermined time interval, b. developing the exposed first photographically sensitive surface to produce a halftone negative, c. producing a halftone printing plate from said halftone negative, d. exposing a second photographically sensitive substrate to said original copy through a random pattern screen for a second predetermined time interval, e. said second predetermined time interval being longer than said first predetermined time interval, f. photographically developing the exposed second light sensitive substrate to produce a second negative, g. producing a second printing plate from said second negative, h. printing a paper substrate with said halftone printing plate, and i. printing said paper substrate with said second printing plate, j. said printing steps of paragraphs (h) and (i) being performed in registry to produce a single reproduction of said original copy.
Claim 6
Independent Claim
157 words
A method for the lithographic reproduction of original copy comprising a. exposing a first photographically sensitive surface to said original copy through a halftone screen for a first predetermined time interval, b. developing the exposed first photographically sensitive surface to produce a halftone negative, c. producing a halftone printing plate from said halftone negative, d. exposing a second photographically sensitive substrate to said original copy through a random pattern screen for a second predetermined time interval, e. said second predetermined time interval being longer than said first predetermined time interval, f. photographically developing the exposed second light sensitive substrate to produce a second negative, g. producing a second printing plate from said second negative, h. printing a paper substrate with said halftone printing plate, and i. printing said paper substrate with said second printing plate, j. said printing steps of paragraphs (h) and (i) being performed in registry to produce a single reproduction of said original copy.
Claim 7
Dependent Claim
18 words
The method of claim 4, wherein a. said paper substrate is first printed with said halftone printing plate.
Claim 8
Dependent Claim
26 words
The method of claim 4, wherein a. said random pattern screen is a photographic transparency having more than about 22,500 irregularly shaped areas per square inch.
Claim 9
Dependent Claim
19 words
The method of claim 6, wherein a. said random screen has about 40,000 irregularly shaped areas per square inch.
Claim 10
Dependent Claim
26 words
The method of claim 4, wherein a. said random pattern screen is in contact with said second photographically sensitive substrate during exposure to said original copy.
Claim 11
Dependent Claim
21 words
The method of claim 4, wherein a. said second printing plate is produced by photolithographic techniques directly from said second negative.
Claim 12
Independent Claim
142 words
A method for the lithographic reproduction of predetermined visual subject matter comprising a. producing a master printing plate, b. said producing step including the exposure of a first photographic film to said visual subject matter through a first screen having a predetermined square grid pattern of transparent and opaque areas, c. producing a secondary printing plate, d. said producing step of paragraph (c) including the exposure of a second photographic film to said visual subject matter through a second screen having a random surface pattern e. said second photographic film being overexposed to said visual subject matter relative to said first photographic film, f. printing a paper substrate with said master printing plate, and g. printing said paper substrate with said secondary printing plate, h. The printing steps of paragraphs (f) and (g) being performed in registry thereby producing a single image.
Claim 13
Independent Claim
142 words
A method for the lithographic reproduction of predetermined visual subject matter comprising a. producing a master printing plate, b. said producing step including the exposure of a first photographic film to said visual subject matter through a first screen having a predetermined square grid pattern of transparent and opaque areas, c. producing a secondary printing plate, d. said producing step of paragraph (c) including the exposure of a second photographic film to said visual subject matter through a second screen having a random surface pattern e. said second photographic film being overexposed to said visual subject matter relative to said first photographic film, f. printing a paper substrate with said master printing plate, and g. printing said paper substrate with said secondary printing plate, h. The printing steps of paragraphs (f) and (g) being performed in registry thereby producing a single image.
Claim 14
Dependent Claim
117 words
In the method of reproducing original copy by the halftone process, which includes the step of printing a substrate with a master printing plate produced by photolithographic techniques from a first photographic image of said original copy taken through a halftone screen, the improvement comprising printing said substrate with a secondary printing plate produced by photolithographic techniques from a second photographic image of said original copy taken through a screen having a random surface pattern of irregular configurations, said second photographic image of said original copy being overexposed relative to said first photographic image of said original copy, both of said printing steps being performed in registry to produce a single printed reproduction of said original copy.
Claim 15
Dependent Claim
117 words
In the method of reproducing original copy by the halftone process, which includes the step of printing a substrate with a master printing plate produced by photolithographic techniques from a first photographic image of said original copy taken through a halftone screen, the improvement comprising printing said substrate with a secondary printing plate produced by photolithographic techniques from a second photographic image of said original copy taken through a screen having a random surface pattern of irregular configurations, said second photographic image of said original copy being overexposed relative to said first photographic image of said original copy, both of said printing steps being performed in registry to produce a single printed reproduction of said original copy.
Claim 16
Dependent Claim
25 words
The improved method of claim 11 wherein a. said screen having a random surface pattern has more than approximately 22,500 irregular configurations per square inch.
Claim 17
Dependent Claim
28 words
The method of claim 1 wherein said second photographic film surface is exposed to said original copy for a greater time interval than said first photographic film surface.
Claim 18
Dependent Claim
24 words
The method of claim 4 further including the step of a. prefogging said second photographically sensitive surface prior to exposure to said original copy.
Claim 19
Dependent Claim
26 words
The method of claim 4 wherein a. said second predetermined time interval is about 5 to 7 times as long as said first predetermined time interval.
Claim 20
Dependent Claim
29 words
The method of claim 10 wherein a. the overexposure of said second photographic film, relative to said first photographic film includes the step of prefogging said second photographic film.
Claim 21
Dependent Claim
56 words
The method of claim 10 wherein a. said first photographic film is exposed to said visual subject matter for a first predetermined time interval, b. said second photographic film is exposed to said visual subject matter for a second predetermined time interval, c. said second predetermined time interval is longer than said first predetermined time interval.
Claim 22
Dependent Claim
26 words
The process of claim 17 wherein a. said second predetermined time interval is about 5 to 7 times as long as said first predetermined time interval.
Claim 23
Dependent Claim
19 words
The method of claim 10 wherein a. said second screen has a fine irregular surface having a grained appearance.
Claim 24
Independent Claim
134 words
A method for the lithographic reproduction of visual subject matter comprising a. printing a paperlike substrate with a master printing plate, b. said master printing plate being produced by photolithographic techniques from a first photographic image of said visual subject matter taken through a halftone screen, c. printing said paper like substrate with a secondary printing plate, d. said secondary printing plate being produced by photolithographic techniques from a second photographic image of said visual subject matter taken through a screen in the form of a photographic transparency having a random surface pattern of irregular configurations, e. said second photographic image being overexposed to said visual subject matter, relative to said first photographic image, f. both of the printing steps being performed in registry to produce a single reproduction of said visual subject matter.
Claim 25
Independent Claim
134 words
A method for the lithographic reproduction of visual subject matter comprising a. printing a paperlike substrate with a master printing plate, b. said master printing plate being produced by photolithographic techniques from a first photographic image of said visual subject matter taken through a halftone screen, c. printing said paper like substrate with a secondary printing plate, d. said secondary printing plate being produced by photolithographic techniques from a second photographic image of said visual subject matter taken through a screen in the form of a photographic transparency having a random surface pattern of irregular configurations, e. said second photographic image being overexposed to said visual subject matter, relative to said first photographic image, f. both of the printing steps being performed in registry to produce a single reproduction of said visual subject matter.
Claim 26
Dependent Claim
22 words
The method of claim 20 wherein a. said random surface pattern of the screen has approximately 40,000 irregular configurations per square inch.
Claim 27
Dependent Claim
13 words
An improved lithographic reproduction produced according to the improved method of claim 11.
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |