Patent US2979403A successfully refreshed from Google Patents.
US2979403A
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Electrostatic printing
Assignee: RCA Corp
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Filing: 1958-10-24
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Granted: 1961-04-11
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Expires: 1978-10-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward C Giaimo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF ELECTROSTATIC PRINTING COMPRISING THE STEPS OF APPLYING A FIRST UNIFORM ELECTROSTATIC CHANGE OF ONE POLARITY TO A SURFACE OF A PHOTOCONDUCTIVE INSULATING LAYER, PROJECTING A PATTERN OF RADIANT ENERGY TO WHICH SAID LAYER IS SENSITIVE TO PROVIDE A SECOND ELECTROSTATIC IMAGE TROSTATIC IMAGE, THEN APPLYING A SECOND UNIFORM ELECTROSTATIC CHANGE OF SAID ONE POLARITY TO SAID SURFACE, BRIEFLY FLOODING SAID SURFACE WITH RADIANT ENERGY TO WHICH SAID LAYER IS POSITIVE TO PROVIDE A SECOND ELECTROSTIC IMAGE IN REVERSE CONFIGURATION WITH RESPECT TO FIRST ELECTROSTATIC IMAGE, AND APPLYING AN ELECTROSTATICALLY CHARGED DEVELOPER SUBSTANCE TO SAID SURFACE WHEREBY A REVERSE VISIBLE IMAGE IS PRODUCED.
Claim 2
Independent Claim
105 words
A METHOD OF ELECTROSTATIC PRINTING COMPRISING THE STEPS OF APPLYING A FIRST UNIFORM ELECTROSTATIC CHANGE OF ONE POLARITY TO A SURFACE OF A PHOTOCONDUCTIVE INSULATING LAYER, PROJECTING A PATTERN OF RADIANT ENERGY TO WHICH SAID LAYER IS SENSITIVE TO PROVIDE A SECOND ELECTROSTATIC IMAGE TROSTATIC IMAGE, THEN APPLYING A SECOND UNIFORM ELECTROSTATIC CHANGE OF SAID ONE POLARITY TO SAID SURFACE, BRIEFLY FLOODING SAID SURFACE WITH RADIANT ENERGY TO WHICH SAID LAYER IS POSITIVE TO PROVIDE A SECOND ELECTROSTIC IMAGE IN REVERSE CONFIGURATION WITH RESPECT TO FIRST ELECTROSTATIC IMAGE, AND APPLYING AN ELECTROSTATICALLY CHARGED DEVELOPER SUBSTANCE TO SAID SURFACE WHEREBY A REVERSE VISIBLE IMAGE IS PRODUCED.
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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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |