US3121010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing
Assignee: RCA Corp
•
Filing: 1961-03-22
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Granted: 1964-02-11
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Expires: 1981-03-22
Abstract
No abstract record available.
Inventors
- 👤 Sigurd W Johnson
- 👤 John P Lauriello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:30
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22; G03G15/00; G03G15/04; G03G15/04027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD OF ELECTROPHOTOGRAPHY COMPRISING THE STEPS OF SUBSTANTIALLY UNIFORMLY EXPOSING A PHOTOCONDUCTIVE INSULATING SURFACE TO CORONA DISCHARGE OF ONE POLARITY; EXPOSING SAID SURFACE TO A SCREEN PATTERN LIGHT IMAGE; SUBSTANTIALLY UNIFORMLY EXPOSING SAID SURFACE TO CORONA DISCHARGE OF SAID ONE POLARITY; EXPOSING SAID SURFACE TO A CONTINUOUS TONE LIGHT IMAGE; AND APPLYING TO SAID SURFACE AN ELECTROSCOPIC TONER TO PRODUCE THERON A VISIBLE SCREENED REPRODUCTION OF SAID ORIGINAL LIGHT IMAGE.
Claim 2
Independent Claim
71 words
A METHOD OF ELECTROPHOTOGRAPHY COMPRISING THE STEPS OF SUBSTANTIALLY UNIFORMLY EXPOSING A PHOTOCONDUCTIVE INSULATING SURFACE TO CORONA DISCHARGE OF ONE POLARITY; EXPOSING SAID SURFACE TO A SCREEN PATTERN LIGHT IMAGE; SUBSTANTIALLY UNIFORMLY EXPOSING SAID SURFACE TO CORONA DISCHARGE OF SAID ONE POLARITY; EXPOSING SAID SURFACE TO A CONTINUOUS TONE LIGHT IMAGE; AND APPLYING TO SAID SURFACE AN ELECTROSCOPIC TONER TO PRODUCE THERON A VISIBLE SCREENED REPRODUCTION OF SAID ORIGINAL LIGHT IMAGE.
References Cited (Backward Citations)
US2598732A
Cited
US2979403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |