US2811465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing
Assignee: RCA Corp
•
Filing: 1952-04-30
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Granted: 1957-10-29
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Expires: 1972-04-30
Abstract
No abstract record available.
Inventors
- 👤 Harold G Greig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:33
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0818; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE METHOD OF DEVELOPING LATENT ELECTROSTATIC CHARGE IMAGES ON A RECORD RECEIVING MEMBER COMPRISING THE STEPS OF APPLYING A SUBSTANTIALLY UNIFORM DISTRIBUTION OF ELECTROSCOPIC DEVELOPER POWDER TO THE SURFACE OF A SUBSTANTIALLY CYLINDRICAL SURFACE CAPABLE OF RETAINING, THROUGH AN ATTRACTIVE FORCE, A QUANTITY OF SAID POWDER THEREON, CHARGING SAID POWDER BY EXPOSURE TO A CORONA DISCHARGE, ROLLING SAID SURFACE IN CONTACT WITH THE SURFACE OF A RECORD RECEIVING MEMBER BEARING A LATENT ELECTROSTATIC CHARGE IMAGE, AND TRANSFERRING PORTIONS OF SAID DEVELOPER POWDER TO AREAS OF SAID RECORD RECEIVING MEMBER CORRESPONDING TO SAID CHARGE IMAGE DURING SAID CONTACT THROUGH AN ELECTROSTATIC ATTRACTIVE FORCE ESTABLISHED BY SAID CHARGE IMAGE WHICH IS GREATER THAN SAID FIRST MENTIONED ATTRACTIVE FORCE.
Claim 2
Independent Claim
116 words
THE METHOD OF DEVELOPING LATENT ELECTROSTATIC CHARGE IMAGES ON A RECORD RECEIVING MEMBER COMPRISING THE STEPS OF APPLYING A SUBSTANTIALLY UNIFORM DISTRIBUTION OF ELECTROSCOPIC DEVELOPER POWDER TO THE SURFACE OF A SUBSTANTIALLY CYLINDRICAL SURFACE CAPABLE OF RETAINING, THROUGH AN ATTRACTIVE FORCE, A QUANTITY OF SAID POWDER THEREON, CHARGING SAID POWDER BY EXPOSURE TO A CORONA DISCHARGE, ROLLING SAID SURFACE IN CONTACT WITH THE SURFACE OF A RECORD RECEIVING MEMBER BEARING A LATENT ELECTROSTATIC CHARGE IMAGE, AND TRANSFERRING PORTIONS OF SAID DEVELOPER POWDER TO AREAS OF SAID RECORD RECEIVING MEMBER CORRESPONDING TO SAID CHARGE IMAGE DURING SAID CONTACT THROUGH AN ELECTROSTATIC ATTRACTIVE FORCE ESTABLISHED BY SAID CHARGE IMAGE WHICH IS GREATER THAN SAID FIRST MENTIONED ATTRACTIVE FORCE.
References Cited (Backward Citations)
US1784912A
Cited
US2357809A
Cited
US2332514A
Cited
US2302179A
Cited
US2345941A
Cited
US2483462A
Cited
US2618552A
Cited
US2618551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |