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US3700449A Expired / Lapsed US ⏱️ 0.0 years remaining

Physical development of a thin reversibly activatable photoconductor element having a resinous barrier layer

Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1970-03-23
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Granted: 1972-10-24
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Expires: 1990-03-23
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Abstract

Abstract THIS INVENTION RELATES TO A PHOTOGRAPHIC IMAGING MEDIUM COMPRISING A SUBSTRATE, REVERSIBLY ACTIVATABLE PHOTOCONDUCTOR LAYER PREFERABLY HAVING A THICKNESS OF LESS THAN ABOUT 2 MICRONS, AND A WATER OR ALCOHOL SOLUBLE, TRANSPARENT BARRIER LAYER HAVING A LOW PERMEABILITY TO OXYGEN OVER SAID RADIATION ACTIVATABLE PHOTO-CONDUCTOR LAYER. THE PHOTOGRAPHIC IMAGING MEDIUM IS CHARACTERIZED BY THE BARRIER LAYER WHICH SUBSTANTIALLY PROLONGS DECAY TIME OF A LATENT IMAGE STORED IN THE PHOTOCONDUCTOR WHICH LATENT IMAGE HAS BEEN FORMED BY EXPOSURE TO A SOURCE OF ACTIVATING RADIATION. PROLONGED DECAY TIME IS BELIEVED TO BE DUE TO THE BARRIER LAYER PREVENTING MASS TRANSPORT OF OXYGEN FROM THE ATMOSPHERE TO THE PHOTOCONDUCTOR.

Inventors

  • 👤 Harry Lerner

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 20:24
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/705; Y; Y10; Y10S; Y10S430/00; Y10S430/162

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-10-24 1976-04-24 1976-10-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-10-24 1980-04-24 1980-10-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-10-24 1984-04-24 1984-10-24 $7700.00 Window Closed / Lapsed

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