Patent US3124457A successfully refreshed from Google Patents.
US3124457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge
Assignee: —
•
Filing: —
•
Granted: 1964-03-10
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:25
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0825; G03G15/00; G03G15/14; G03G15/16; G03G9/083; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
AN ELECTROSTATIC APPARATUS FOR FORMING DIFFERENTIAL IMAGES ON COPY SURFACES COMPRISING: (A) AN INSULATING IMAGE SURFACE, (B) MEANS TO APPLY TWO IMAGE PATTERNS OF OPPOSITE POLARITY ELECTROSTATIC CHARGE IN REGISTER WITH EACH OTHER TO SAID INSULATING IMAGE SURFACE, (C) MEANS TO APPLY FINELY DIVIDED ELECTROSCOPIC DEVELOPING PARTICLES CHARGED TO BOTH POLARITIES TO SAID IMAGES, THE PARTICLES CHARGED TO ONE OF SAID POLARITIES ALSO BEING MAGNETIC, (D) MEANS TO CHARGE THE DEVELOPING PARTICLES OF BOTH DEVELOPED IMAGE PATTERNS TO ONE POLARITY, (E) MEANS TO TRANSFER A SUBSTANTIAL PORTION OF SAID PARTICLES ON SAID IMAGES TO A FIRST COPY SURFACE, (F) AND MEANS TO MAGNETICALLY TRANSFER THE REMAINING MAGNETIC PARTICLES TO A SECOND COPY SURFACE.
Claim 2
Dependent Claim
113 words
AN ELECTROSTATIC APPARATUS FOR FORMING DIFFERENTIAL IMAGES ON COPY SURFACES COMPRISING: (A) AN INSULATING IMAGE SURFACE, (B) MEANS TO APPLY TWO IMAGE PATTERNS OF OPPOSITE POLARITY ELECTROSTATIC CHARGE IN REGISTER WITH EACH OTHER TO SAID INSULATING IMAGE SURFACE, (C) MEANS TO APPLY FINELY DIVIDED ELECTROSCOPIC DEVELOPING PARTICLES CHARGED TO BOTH POLARITIES TO SAID IMAGES, THE PARTICLES CHARGED TO ONE OF SAID POLARITIES ALSO BEING MAGNETIC, (D) MEANS TO CHARGE THE DEVELOPING PARTICLES OF BOTH DEVELOPED IMAGE PATTERNS TO ONE POLARITY, (E) MEANS TO TRANSFER A SUBSTANTIAL PORTION OF SAID PARTICLES ON SAID IMAGES TO A FIRST COPY SURFACE, (F) AND MEANS TO MAGNETICALLY TRANSFER THE REMAINING MAGNETIC PARTICLES TO A SECOND COPY SURFACE.
References Cited (Backward Citations)
US3045587A
Cited
US3013890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |