US2590830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsion sensitometry
Assignee: GAF Chemicals Corp
•
Filing: 1948-10-14
•
Granted: 1952-03-25
•
Expires: 1968-10-14
Abstract
No abstract record available.
Inventors
- 👤 Williford Edward Allan
- 👤 Monroe H Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:25
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/02; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
A CONTINUOUS PROCESS FOR MEASURING THE RELATIVE SENSITOMETRIC CHARCTERISTICS OF A PHOTOGRAPHIC SILVER HALIDE EMULSION WHICH COMPRISES CAUSING A PORTION OF THE EMULSION IN LIQUID FORM TO FLOW IN A STREAM AT A PREDETERMINED CONSTANT RATE, EXPOSING A LIMITED ZONE OF SAID STREAM TO ILLUMINATION OF PREDETERMINED INTENSITY, ADDING A DEVELOPER AT A CONSTANT RATE TO SAID STREAM BEYOND THE EXPOSURE ZONE, ADDING A DEVELOPMENT ARRESTING REAGENT AT A CONSTANT RATE AT A POINT SPACED FROM THE POINT OF INTRODUCTION OF SAID DEVELOPER, THE INTERVENING PORTION OF THE STREAM CONSTITUTING A DEVELOPMENT ZONE, AND MEASURING THE OPTICAL DENSITY OF THE STREAM TO TRANSMITTED LIGHT BEYOND SAID DEVELOPMENT ZONE.
References Cited (Backward Citations)
US2126516A
Cited
US2401051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |