US2982647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic image reproduction
Assignee: Xerox Corp
•
Filing: 1956-06-14
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Granted: 1961-05-02
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Expires: 1976-06-14
Abstract
No abstract record available.
Inventors
- 👤 Chester F Carlson
- 👤 Bogdonoff Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:16
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/14; G03G13/18; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A METHOD OF FORMING AN ELECTROSTATIC CHARGE PATTERN ON A FIRST SURFACE OF INSULATING MATERIAL IN WHICH THE INSULATING SURFACE IS PLACED IN FACING PHYSICAL CONTACT WITH A SECOND INSULATING SURFACE BEARING AN ELECTROSTATIC CHARGE PATTERN OF A FIRST POLARITY AND IN WHICH IN ORDER TO ACCOMPLISH CHARGE TRANSFER FROM SAID SECOND SURFACE TO SAID FIRST SURFACE A FIELD IS APPLIED BETWEEN SAID SURFACES OF AN INTENSITY, IN THE ABSENCE OF ANY PHOTOELECTRIC EFFECT, EXCEEDING THE THRESHOLD OF FIELD DISCHARGE, THE IMPROVEMENT COMPRISING APPLYING TO SAID FIRST SURFACE A UNIFORM ELECTROSTATIC CHARGE OF SAID FIRST POLARITY PRIOR TO POSITIONING SAID FIRST SURFACE ACROSS SAID SECOND SURFACE BEARING SAID ELECTROSTATIC CHARGE PATTERN.
Claim 2
Dependent Claim
112 words
IN A METHOD OF FORMING AN ELECTROSTATIC CHARGE PATTERN ON A FIRST SURFACE OF INSULATING MATERIAL IN WHICH THE INSULATING SURFACE IS PLACED IN FACING PHYSICAL CONTACT WITH A SECOND INSULATING SURFACE BEARING AN ELECTROSTATIC CHARGE PATTERN OF A FIRST POLARITY AND IN WHICH IN ORDER TO ACCOMPLISH CHARGE TRANSFER FROM SAID SECOND SURFACE TO SAID FIRST SURFACE A FIELD IS APPLIED BETWEEN SAID SURFACES OF AN INTENSITY, IN THE ABSENCE OF ANY PHOTOELECTRIC EFFECT, EXCEEDING THE THRESHOLD OF FIELD DISCHARGE, THE IMPROVEMENT COMPRISING APPLYING TO SAID FIRST SURFACE A UNIFORM ELECTROSTATIC CHARGE OF SAID FIRST POLARITY PRIOR TO POSITIONING SAID FIRST SURFACE ACROSS SAID SECOND SURFACE BEARING SAID ELECTROSTATIC CHARGE PATTERN.
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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) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |