US3797934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for making multigraded tv masks
Assignee: Buckbee Mears Co
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Filing: 1971-10-06
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Granted: 1974-03-19
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Expires: 1991-10-06
Abstract
Abstract A method for forming a multigraded negative by utilizing an arcuate shaped light diffuser of uniform thickness.
Inventors
- 👤 G Miller
- 👤 G Munter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:23
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/02; G03B; G03B15/00; H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; H01J2229/00; H01J2229/07; H01J2229/0727; H01J2229/075; H01J2229/0755; H01J2229/0761
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
An apparatus for producing a multigraded image comprising: a source of light energy located along an optical axis; said source of light energy including means for rotating the light source about said axis for at least 360* during exposure of the photosensitive plate; a diffuser for decreasing the intensity of the light projectible through the diffuser in a predetermined direction, said light diffuser having a uniform thickness and an arcuate shape, said diffuser located along said optical axis; a master plate having a set of openings and located along said optical axis on the opposite side of said diffuser from said source of light; and a photosensitive plate located adjacent said master plate and on the opposite side from said diffuser so that said light source exposes the portions of the photosensitive plate that are not shielded by said master plate in proportion to the intensity of the light arriving at said plate.
Claim 2
Independent Claim
153 words
An apparatus for producing a multigraded image comprising: a source of light energy located along an optical axis; said source of light energy including means for rotating the light source about said axis for at least 360* during exposure of the photosensitive plate; a diffuser for decreasing the intensity of the light projectible through the diffuser in a predetermined direction, said light diffuser having a uniform thickness and an arcuate shape, said diffuser located along said optical axis; a master plate having a set of openings and located along said optical axis on the opposite side of said diffuser from said source of light; and a photosensitive plate located adjacent said master plate and on the opposite side from said diffuser so that said light source exposes the portions of the photosensitive plate that are not shielded by said master plate in proportion to the intensity of the light arriving at said plate.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein said master contains a plurality of parallel elongated openings of uniform width.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein the set of openings in said master are of uniform width.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |