US3885970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsion with silver halide grains having one twinning plane
Assignee: Fujifilm Holdings Corp
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Filing: 1974-05-13
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Granted: 1975-05-27
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Expires: 1994-05-13
Abstract
Abstract This invention provides a photographic silver halide emulsion containing more than 30 percent by weight, based on the total silver halide crystals, of silver halide crystals which have only one twinning plane in a crystal and of which boundary planes with a dispersing medium comprise a (100) plane, a (111) plane or mixed planes thereof. The silver halide emulsion of this invention is monodispersible and provides a high optical sensitization rate and less occurrence of fog. Moreover, the emulsion has a high contrast characteristic and a high development rate. The emulsion of this invention has a further feature of reducing reciprocity law failure.
Inventors
- 👤 Junji Miyahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:10
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C1/0051; G03C2001/0058; Y; Y10; Y10S; Y10S430/00; Y10S430/166
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION COMPRISING A DISPERSING MEDIUM CONTAINING SILVER HALIDE CRYSTALS OF WHICH A PROPORTION OF MORE THAN 30 PERCENT BY WEIGHT OF THE SILVER HALIDE CRYSTALS HAVE ONLY ONE TWINNING PLANE IN EACH CRYSTAL AND OF WHICH THE BONDARY PLANES WITH THE DISPERSING MEDIUM COMPRISE A (100) PLANE, A (111) PLANE OR MIXED (100) AND (111) PLANES TO THE TOTAL SILVER HALIDE CRYSTALS.
Claim 2
Dependent Claim
66 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION COMPRISING A DISPERSING MEDIUM CONTAINING SILVER HALIDE CRYSTALS OF WHICH A PROPORTION OF MORE THAN 30 PERCENT BY WEIGHT OF THE SILVER HALIDE CRYSTALS HAVE ONLY ONE TWINNING PLANE IN EACH CRYSTAL AND OF WHICH THE BONDARY PLANES WITH THE DISPERSING MEDIUM COMPRISE A (100) PLANE, A (111) PLANE OR MIXED (100) AND (111) PLANES TO THE TOTAL SILVER HALIDE CRYSTALS.
Claim 3
Dependent Claim
23 words
The photographic silver halide emulsion of claim 1, wherein said proportion is more than 50 percent by weight of the silver halide crystals.
Claim 4
Dependent Claim
27 words
The photographic silver halide emulsion of claim 1, wherein said silver halide crystals are crystals of silver chloride, silver bromide, silver bromochloride, silver bromoiodide or silver bromoiodochloride.
Claim 5
Dependent Claim
16 words
The photographic silver halide emulsion of claim 1, wherein said dispersing medium is a hydrophilic binder.
Claim 6
Dependent Claim
49 words
The photographic silver halide emulsion of claim 4, wherein said hydrophilic binder is gelatin, a gelatin derivative, a graft gelatin, colloidal albumin, casein, carboxymethyl cellulose, hydroxyethyl cellulose, agar, sodium alginate, a starch derivative, polyvinyl alcohol, poly-N-vinyl-pyrrolidone, a polyacrylic acid copolymer, a polyacrylamide, a polyacrylamide derivative, or a mixture thereof.
Claim 7
Dependent Claim
40 words
The photographic silver halide emulsion of claim 1, wherein said emulsion includes at least one of an optical sensitizer, a stabilizing agent, an antifogging agent, a coating aid, a development accelerator, a color coupler and a dimensional stability improving agent.
Claim 8
Dependent Claim
20 words
A photographic light-sensitive element comprising a support having thereon a layer of the photographic silver halide emulsion of claim 1.
References Cited (Backward Citations)
US3655394A
Cited
US3817756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |