US3663228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic film having extended exposure-response characteristics
Assignee: APPLIED PHOTO SCIENCES
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Filing: 1969-11-14
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Granted: 1972-05-16
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Expires: 1989-11-14
Abstract
Abstract A color photographic film with extended exposure response characteristics having a plurality of emulsion layers divided into sets, each set having a different photographic speed. The emulsion layers within a set have the same photographic speed but each layer is responsive to a different region of the spectrum. The emulsion layers are arranged either one above the other or side-by-side in a geometric pattern and all have D-log characteristic curves which have substantially equal slopes. The effective speed of one set is adjusted such that it commences responding to impinging light as another set approaches saturation. This is accomplished either by selection of the basic sensitivities of the various emulsions or by the use of auxiliary means such as attenuating filters. Dye-forming couplers may be incorporated during manufacture in all emulsion layers or may be introduced during processing. The invention may also be incorporated into a number of embodiments employing either the diazo or diffusion transfer processes. In addition apparatus employing the principles of the invention is described.
Inventors
- 👤 Charles W Wyckoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:23
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/26; G03C1/00; G03C1/005; G03C1/46; G03C1/76; G03C1/805; G03C7/30; G03C7/3029
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
28 words
A color photographic film as claimed in claim 1 in which the total spectral response of said pairs of photosensitive emulsions extends through at least the visible spectrum.
Claim 2
Dependent Claim
34 words
A color photographic film as claimed in claim 1 in which said fifth filter is a color filter for blocking said predetermined proportion of the incident light in said third region of the spectrum.
Claim 3
Dependent Claim
26 words
A photographic film as claimed in claim 1 in which said fifth filter is a neutral density filter for blocking said predetermined proportion of incident light.
Claim 4
Dependent Claim
241 words
A color photographic film comprising a film support; three pairs of silver halide photosensitive emulsions coated in layers upon the film support, the top pair being responsive to blue light only, the middle pair being responsive to at least green light, and the third pair being responsive to at least red light; a first yellow filter interposed between the two emulsion layers of the first pair, said filter blocking a predetermined proportion of the blue light to shift the speed of the lower emulsion of the first pair to provide complementary speeds in the emulsions of the top pair; a second yellow filter interposed between the top pair and the middle pair of emulsions to block substantially all the blue light from passing therethrough; a first magenta filter interposed between the two emulsion layers of the second pair, said filter blocking a predetermined proportion of the green light to shift the speed of the lower emulsion of the second pair to provide complementary speeds in the emulsions of the second pair; a second magenta filter interposed between the middle pair and the third pair of emulsions to block substantially all the green light from passing therethrough; and a further filter interposed between the two emulsion layers of the third pair to block a predetermined proportion of the red light incident thereupon to shift the photographic speed of the lower emulsion to provide complementary speeds in the emulsions of the third pair.
Claim 5
Dependent Claim
18 words
A color photographic film as claimed in claim 5 in which said further filter is a cyan filter.
Claim 6
Dependent Claim
19 words
A color photographic film as claimed in claim 5 in which said further filter is a neutral density filter.
Claim 7
Dependent Claim
122 words
A color photographic film comprising: a film support; a first set of silver halide photosensitive emulsions coated in layers upon said film support; each emulsion in said first set being responsive to a different region of the spectrum, the emulsions within said set having substantially the same speed; a second set of silver halide photosensitive emulsions coated in layers above said first set, the emulsions in the second set having substantially the same spectral response as the emulsions of the first set; and a neutral density filter disposed intermediate the two sets, the attenuating effect of said filter being to shift the speed of the emulsions of the lower set a predetermined amount to provide the sets of emulsions with complementary speeds.
Claim 8
Dependent Claim
24 words
A color photographic film as claimed in claim 8 in which said first and second sets of emulsions have substantially the same photographic speed.
Claim 9
Dependent Claim
20 words
A color photographic film as claimed in claim 8 in which the second set of emulsions are fast ammoniacal emulsions.
Claim 10
Dependent Claim
77 words
A color photographic film comprising: a film support; two sets of silver halide photosensitive emulsions coated in layers upon said film support, each set containing a red-sensitive emulsion, a green-sensitive emulsion and a blue-sensitive emulsion; and a neutral density filter disposed between the two sets of emulsions, the attenuating effect of the filter being, to shift the speed of the lower set of emulsions a predetermined amount To provide the two sets of emulsions with complementary speeds.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |