Patent US3279920A successfully refreshed from Google Patents.
US3279920A
Expired / Lapsed
US
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Photographic developing process for producing positive or negative images
Assignee: Technical Operations Inc
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Filing: 1963-01-17
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Granted: 1966-10-18
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Expires: 1983-01-17
Abstract
No abstract record available.
Inventors
- 👤 Ignatius E Theodorou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:23
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/494; G03C1/496; G03C1/4965; G03C1/76; G03C5/00; G03C5/26; G03C5/50; F; F04; F04C; F04C2/00; F04C2/30; F04C2/40; Y; Y10; Y10S; Y10S430/00; Y10S430/133; Y10S430/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR PRODUCING, OPTICALLY, DIRECT POSITIVE OR NEGATIVE IMAGES, SAID PROCESS COMPRISING: EXPOSING THE RADIATION TO FORM A LATENT IMAGE, A PHOTOSENSITIVE MEDIUM COMPRISING A STRATUM OF MICROCRYSTALLINE, SUBSTANTIALLY BINDER-FREE, HOMOGENOUS SILVER HALIDE, SANDWICHED BETWEEN A SUBSTANTIALLY INERT SUPPORT AND A THIN FILM OF A SUBSTANTIALLY SOLID, ORGANIC, TRANSPARENT, POLYMERIC MATERIAL PERMEABLE TO A SELECTED SILVER-HALIDE DEVELOPER SOLUTION; SELECTING ONE OF A SURFACE SILVER HALIDE DEVELOPER SOLUTION AND AN INTERNAL SILVER HALIDE DEVELOPER SOLUTION; PERMEATING SAID FILM OF THE EXPOSED MEDIUM WITH THE SELECTED DEVELOPER SOLUTION UNDER PREDETERMINED CONDITIONS OF AMBIENT ACTINIC ILLUMINATION TO FORM THEREBY A VISIBLE SILVER IMAGE AT SAID STRATUM, SAID IMAGE BEING A DIRECT POSITIVE WHEN SAID SOLUTION IS SAID SURFACE DEVELOPER SOLUTION AND ACTINIC ILLUMINATION IS PRESENT, AND BEING A MEGATIVE WHEN SAID SOLUTION IS EITHER OF SAID DEVELOPER SOLUTIONS AND AMBIENT ACTINIC ILLUMINATION IS SUBSTANTIALLY ABSENT.
Claim 2
Dependent Claim
143 words
A PROCESS FOR PRODUCING, OPTICALLY, DIRECT POSITIVE OR NEGATIVE IMAGES, SAID PROCESS COMPRISING: EXPOSING THE RADIATION TO FORM A LATENT IMAGE, A PHOTOSENSITIVE MEDIUM COMPRISING A STRATUM OF MICROCRYSTALLINE, SUBSTANTIALLY BINDER-FREE, HOMOGENOUS SILVER HALIDE, SANDWICHED BETWEEN A SUBSTANTIALLY INERT SUPPORT AND A THIN FILM OF A SUBSTANTIALLY SOLID, ORGANIC, TRANSPARENT, POLYMERIC MATERIAL PERMEABLE TO A SELECTED SILVER-HALIDE DEVELOPER SOLUTION; SELECTING ONE OF A SURFACE SILVER HALIDE DEVELOPER SOLUTION AND AN INTERNAL SILVER HALIDE DEVELOPER SOLUTION; PERMEATING SAID FILM OF THE EXPOSED MEDIUM WITH THE SELECTED DEVELOPER SOLUTION UNDER PREDETERMINED CONDITIONS OF AMBIENT ACTINIC ILLUMINATION TO FORM THEREBY A VISIBLE SILVER IMAGE AT SAID STRATUM, SAID IMAGE BEING A DIRECT POSITIVE WHEN SAID SOLUTION IS SAID SURFACE DEVELOPER SOLUTION AND ACTINIC ILLUMINATION IS PRESENT, AND BEING A MEGATIVE WHEN SAID SOLUTION IS EITHER OF SAID DEVELOPER SOLUTIONS AND AMBIENT ACTINIC ILLUMINATION IS SUBSTANTIALLY ABSENT.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |