Patent US2976144A successfully refreshed from Google Patents.
US2976144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotography
Assignee: RCA Corp
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Filing: 1958-10-24
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Granted: 1961-03-21
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Expires: 1978-10-24
Abstract
No abstract record available.
Inventors
- 👤 Rose Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:49
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0821; G03G9/0823; G03G13/00; G03G13/06; G03G13/08; G03G15/00; G03G15/06; G03G15/08; G03G15/082; G03G15/22; G03G15/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF PRODUCING A VISIBLE POWDER IMAGE ON AN UNCHARGED ELECTROPHOTOGRAPHIC ELEMENT COMPRISING A SUBSTRATE HAVING A COATING THEREON AND IN INTIMATE CONTACT THEREWITH OF A FINELY-DIVIDED PHOTOCONDUCTOR DISPERSED IN AN ELECTRICALLY INSULATING VEHICLE, SAID METHOD COMPRISING THE STEPS OF MAINTAINING SAID ELEMENT IN DARKNESS TO SUBSTANTIALLY REDUCE THE CONDUCTIVITY OF SAID COATING, THEN, BEFORE APPLYING ANY ELECTRIC FIELD TO SAID ELEMENT, EXPOSING SAID COATING TO A LIGHT IMAGE TO PRODUCE THEREON A LATENT CONDUCTIVITY PATTERN IN SUBSTANTIAL CONFIGURATION WITH SAID LIGHT IMAGE, THEREAFTER CONTACTING
Claim 2
Independent Claim
86 words
A METHOD OF PRODUCING A VISIBLE POWDER IMAGE ON AN UNCHARGED ELECTROPHOTOGRAPHIC ELEMENT COMPRISING A SUBSTRATE HAVING A COATING THEREON AND IN INTIMATE CONTACT THEREWITH OF A FINELY-DIVIDED PHOTOCONDUCTOR DISPERSED IN AN ELECTRICALLY INSULATING VEHICLE, SAID METHOD COMPRISING THE STEPS OF MAINTAINING SAID ELEMENT IN DARKNESS TO SUBSTANTIALLY REDUCE THE CONDUCTIVITY OF SAID COATING, THEN, BEFORE APPLYING ANY ELECTRIC FIELD TO SAID ELEMENT, EXPOSING SAID COATING TO A LIGHT IMAGE TO PRODUCE THEREON A LATENT CONDUCTIVITY PATTERN IN SUBSTANTIAL CONFIGURATION WITH SAID LIGHT IMAGE, THEREAFTER CONTACTING
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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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |