US3679818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and medium for producing color images
Assignee: AT&T Inc
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Filing: 1971-04-23
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Granted: 1972-07-25
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Expires: 1991-04-23
Abstract
Abstract A film with a repeating color filter dot pattern on one side and an opaque coating such as bismuth metal on the other side, serves as a medium for reproducing color transparencies. Laser light having the same frequency as the dot color is directed through those dots constituting the desired image. The metallic coating behind each such dot is thereby evaporated, leaving the dot color unaffected. Illumination from the metal side produces the desired projected image. The image may also be viewed in reflected light by placing the film against a white background sheet.
Inventors
- 👤 Jeofry Stuart Courtney-Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:44
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/24; H; H04; H04N; H04N1/00; H04N1/46; H04N1/50; B41M5/26; B41M5/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A system pursuant to claim 1, wherein said coating is reflective and metallic, and wherein said optical beam-producing means comprises plural laser beams each corresponding in center frequency to a one of the colors of said color dots, said beams being mounted on the color dot side of said film, the energy level of each said beam being lower than that required to alter the color filter dots of a corresponding frequency but high enough to remove said metallic coating behind a dot of said corresponding frequency.
Claim 2
Dependent Claim
15 words
A system pursuant to claim 2, wherein said coating comprises an evaporated layer of bismuth.
Claim 3
Dependent Claim
67 words
A system pursuant to claim 1, wherein said opaque coating is nonreflective; wherein said optical beam-producing means comprises a single laser beam mounted on the opaque coating side of said film and having sufficient intensity to remove said coating; and wherein said beam-directing means directs said beam onto regions behind all color dots which correspond to said color elements, thereby removing in said regions said opaque coating.
Claim 4
Dependent Claim
11 words
A system pursuant to claim 4, wherein said coating is carbon.
Claim 5
Dependent Claim
35 words
A system pursuant to claim 4, further comprising a reflective backing sheet disposed on the opaque coating side of said medium, thereby permitting an image produced in said medium to be viewed in reflected light.
Claim 6
Dependent Claim
31 words
A system pursuant to claim 1, wherein the color in each said dot is capable of being removed by an incident optical beam of a different frequency than the said dot.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |