Patent US3216844A successfully refreshed from Google Patents.
US3216844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing electrostatic image with photoconductive donor member
Assignee: Xerox Corp
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Filing: 1962-03-02
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Granted: 1965-11-09
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Expires: 1982-03-02
Abstract
No abstract record available.
Inventors
- 👤 Paul F King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:47
CPC Classifications
G; G03; G03G; G03G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD OF DEVELOPING A LATENT ELECTROSTATIC IMAGE OF POSITIVE POLARITY ON A MEMBER, COMPRISING; LOADING THE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER OF A DONOR MEMBER COMPRISING AN N TYPE PHOTOCONDUCTIVE INSULATING LAYER OVERLYING A CONDUCTIVE BACKING WITH A LAYER OF FINELY DIVIDED MARKING PARTICLES CARRYING A NEGATIVE ELECTROSTATIC CHARGE; BRINGING THE LOADED DONOR MEMBER INTO CONTIGUOUS RELATIONSHIP WITH THE IMAGE BEARING MEMBER WITH SAID PARTICLES BETWEEN SAID MEMBERS; AND, SEPARATING THE DONOR MEMBER FROM THE IMAGE BEARING MEMBER WHEREBY THE POSITIVELY CHARGED AREAS OF SAID LATENT ELECTROSTATIC IMAGE SIMULTANEOUSLY ATTRACT MARKING PARTICLES OPPOSITE THEM ON THE SURFACE OF SAID DONOR MEMBER AND INDUCE NEGATIVE CHARGE IN SAID DONOR MEMBER THEREBY CAUSING SAID DONOR MEMBER TO REPEL THE PARTICLES IN AREA CORRESPONDING TO THE CHARGED AREAS OF SAID LATENT ELECTROSTATIC IMAGE.
Claim 2
Independent Claim
132 words
A METHOD OF DEVELOPING A LATENT ELECTROSTATIC IMAGE OF POSITIVE POLARITY ON A MEMBER, COMPRISING; LOADING THE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER OF A DONOR MEMBER COMPRISING AN N TYPE PHOTOCONDUCTIVE INSULATING LAYER OVERLYING A CONDUCTIVE BACKING WITH A LAYER OF FINELY DIVIDED MARKING PARTICLES CARRYING A NEGATIVE ELECTROSTATIC CHARGE; BRINGING THE LOADED DONOR MEMBER INTO CONTIGUOUS RELATIONSHIP WITH THE IMAGE BEARING MEMBER WITH SAID PARTICLES BETWEEN SAID MEMBERS; AND, SEPARATING THE DONOR MEMBER FROM THE IMAGE BEARING MEMBER WHEREBY THE POSITIVELY CHARGED AREAS OF SAID LATENT ELECTROSTATIC IMAGE SIMULTANEOUSLY ATTRACT MARKING PARTICLES OPPOSITE THEM ON THE SURFACE OF SAID DONOR MEMBER AND INDUCE NEGATIVE CHARGE IN SAID DONOR MEMBER THEREBY CAUSING SAID DONOR MEMBER TO REPEL THE PARTICLES IN AREA CORRESPONDING TO THE CHARGED AREAS OF SAID LATENT ELECTROSTATIC IMAGE.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |