US2834676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic diffusion transfer process for producing multiple direct positive copies
Assignee: Unisys Corp
•
Filing: 1955-07-19
•
Granted: 1958-05-13
•
Expires: 1975-07-19
Abstract
No abstract record available.
Inventors
- 👤 Edward I Stanley
- 👤 John J Dughi
- 👤 Hey Walton Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR OBTAINING MULTIPLE COPIES FROM AN EXPOSED SILVER HALIDE EMULSON LAYER WHICH COMPRISES CONTACTING SAID EMULSION LAYER WITH A RECEPTION LAYER CONTAINING DEVELOPMENT NUCLEI, SAID CONTACTING BEING IN THE PRESENCE OF AN ALKALINE SILVER HALIDE DEVELOPER CONTAINING A SILVER HALIDE SOLVENT AND A FIXATON ACCELERATOR SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL AND AMMONIUM CHLORIDES, AND A LATENT IMAGE DESENSITIZER SELECTED FROM THE CLASS CONSISTING OF CUPRIC, MERCURIC, ZINC, AND MANGANESE CHLORIDES, AND A GELATIN SOFTENING AGENT SELECTED FROM THE CLASS CONSISTING OF ALKALI METALAND AMMONIUM NITRATES, SEPARATING THE LAYERS AND RECONTACTING THE SILVER HALIDE EMULSION LAYER WITH ANOTHER RECEPTION LAYER IN THE PRESENCE OF SAID ALKALINE DEVELOPER.
Claim 2
Dependent Claim
111 words
A PROCESS FOR OBTAINING MULTIPLE COPIES FROM AN EXPOSED SILVER HALIDE EMULSON LAYER WHICH COMPRISES CONTACTING SAID EMULSION LAYER WITH A RECEPTION LAYER CONTAINING DEVELOPMENT NUCLEI, SAID CONTACTING BEING IN THE PRESENCE OF AN ALKALINE SILVER HALIDE DEVELOPER CONTAINING A SILVER HALIDE SOLVENT AND A FIXATON ACCELERATOR SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL AND AMMONIUM CHLORIDES, AND A LATENT IMAGE DESENSITIZER SELECTED FROM THE CLASS CONSISTING OF CUPRIC, MERCURIC, ZINC, AND MANGANESE CHLORIDES, AND A GELATIN SOFTENING AGENT SELECTED FROM THE CLASS CONSISTING OF ALKALI METALAND AMMONIUM NITRATES, SEPARATING THE LAYERS AND RECONTACTING THE SILVER HALIDE EMULSION LAYER WITH ANOTHER RECEPTION LAYER IN THE PRESENCE OF SAID ALKALINE DEVELOPER.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |