US4672027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicolor photographic element with a minus blue recording tabular grain emulsion layer overlying a blue recording emulsion layer
Assignee: Eastman Kodak Co
•
Filing: 1986-08-01
•
Granted: 1987-06-09
•
Expires: 2006-08-01
Abstract
Abstract Moderate camera speed photographic elements for producing subtractive primary dye images are disclosed, including one emulsion layer comprised of silver bromide or bromoiodide grains having a mean diameter in the range of from 0.2 to 0.55 μm including tabular grains having an aspect ratio of greater than 8:1 accounting for at least 50 percent of the total projected area of the grains in the emulsion layer and being positioned to receive imaging radiation prior to one or more blue recording emulsion layers. Enhancement of speed-granularity relationships, blue to minus blue speed separation, silver utilization, and image sharpness can all be realized.
Inventors
- 👤 Richard L. Daubendiek
- 👤 Gary L. House
- 👤 Timothy R. Gersey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:27
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3022
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
148 words
A photographic element for producing multicolor dye images comprised of a support, and, coated on said support, superimposed dye image providing layer units comprised of at least one blue recording yellow dye image providing layer unit and at least two minus blue recording layer units including a green recording magenta dye image providing layer unit and a red recording cyan dye image providing layer unit, one of said layer units being positioned to receive imagewise exposing radiation prior to at least one of said blue recording layer units and containing a tabular grain emulsion comprised of a dispersing medium and silver bromide or bromoiodide grains having a mean diameter in the range of from 0.2 to 0.55 μm including tabular grains having an average aspect ratio of greater than 8:1 accounting for at least 50 percent of the total projected area of said grains in said emulsion layer.
Claim 2
Dependent Claim
148 words
A photographic element for producing multicolor dye images comprised of a support, and, coated on said support, superimposed dye image providing layer units comprised of at least one blue recording yellow dye image providing layer unit and at least two minus blue recording layer units including a green recording magenta dye image providing layer unit and a red recording cyan dye image providing layer unit, one of said layer units being positioned to receive imagewise exposing radiation prior to at least one of said blue recording layer units and containing a tabular grain emulsion comprised of a dispersing medium and silver bromide or bromoiodide grains having a mean diameter in the range of from 0.2 to 0.55 μm including tabular grains having an average aspect ratio of greater than 8:1 accounting for at least 50 percent of the total projected area of said grains in said emulsion layer.
Claim 3
Dependent Claim
48 words
A multicolor photographic element according to claim 1 in which said reduced diameter high aspect ratio tabular grain emulsion is located in a layer unit additionally overlying a minus blue recording layer unit and has a mean grain diameter in the range of from 0.4 to 0.55 μm.
Claim 4
Dependent Claim
22 words
A multicolor photographic element according to claim 1 in which said tabular grain emulsion is located in said green recording layer unit.
Claim 5
Dependent Claim
22 words
A multicolor photographic element according to claim 1 in which said tabular grain emulsion is located in said red recording layer unit.
Claim 6
Dependent Claim
25 words
A multicolor photographic element according to claim 1 in which each of said dye image providing layer units includes an incorporated dye image providing compound.
Claim 7
Dependent Claim
40 words
A multicolor photographic element according to claim 1 in which said tabular grain emulsion contains tabular grains having an aspect ratio greater than 8:1 accounting for at least 70 percent of the projected area of grains present in said emulsion.
Claim 8
Dependent Claim
42 words
A multicolor photographic element according to claim 1 in which said tabular grain emulsion contains tabular grains having an aspect ratio of at least 12:1 accounting for at least 50 percent of the total projected area of grains present in said emulsion.
Claim 9
Dependent Claim
109 words
a multicolor photographic element according to claim 1 in which each of said blue, green, and red recording dye image providing layer units contain a tabular grain emulsion comprised of a dispersing medium and silver bromide or bromoiodide grains having a mean diameter in the range of from 0.2 to 0.55 μm including tabular grains having an average aspect ratio of greater than 8:1 accounting for at least 50 percent of the total projected area of said grains in that emulsion layer and each of said layers units overlying a minus blue recording layer unit has a mean grain diameter in the range of from 0.4 to 0.55 μm.
Claim 10
Dependent Claim
24 words
A multicolor photographic element according to claim 1 in which said reduced diameter high aspect ratio tabular grain emulsion is a silver bromoiodide emulsion.
Claim 11
Dependent Claim
129 words
An intermediate camera speed photographic element for producing a multicolor dye image comprised of a support and, coated on said support, superimposed blue, green, and red recording layer units containing yellow, magenta, and cyan dye forming couplers, respectively, including both faster and slower speed blue recording layer units, said faster blue recording layer unit being positioned to receive exposing radiation prior to said slower blue recording layer units and containing a reduced diameter high aspect ratio tabular grain emulsion comprised of a dispersing medium and silver bromoiodide grains having a mean diameter in the range of from 0.2 to 0.55 μm including tabular grains having an aspect ratio of at least 12:1 accounting for at least 70 percent of the total projected area of said grains in said emulsion.
Claim 12
Dependent Claim
129 words
An intermediate camera speed photographic element for producing a multicolor dye image comprised of a support and, coated on said support, superimposed blue, green, and red recording layer units containing yellow, magenta, and cyan dye forming couplers, respectively, including both faster and slower speed blue recording layer units, said faster blue recording layer unit being positioned to receive exposing radiation prior to said slower blue recording layer units and containing a reduced diameter high aspect ratio tabular grain emulsion comprised of a dispersing medium and silver bromoiodide grains having a mean diameter in the range of from 0.2 to 0.55 μm including tabular grains having an aspect ratio of at least 12:1 accounting for at least 70 percent of the total projected area of said grains in said emulsion.
References Cited (Backward Citations)
US3402046A
Cited
US4229525A
Cited
US3989527A
Cited
US4433048A
Cited
US4434226A
Cited
US4435501A
Cited
US4439520A
Cited
US4478929A
Cited
US4435499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |