Patent US3245785A successfully refreshed from Google Patents.
US3245785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphic reproduction
Assignee: 3M Co
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Filing: 1963-01-14
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Granted: 1966-04-12
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Expires: 1983-01-14
Abstract
No abstract record available.
Inventors
- 👤 Carl S Miller
- 👤 Byron W Neher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:45
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/02; G03C; G03C1/00; G03C1/705; G03G13/00; G03G13/22; G03G13/24; G03G5/00; G03G5/02; G03G5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A METHOD FOR REPRODUCTION OF A GRAPHIC ORIGINAL COMPRISING PROJECTING THE GRAPHIC ORIGINAL UPON A PHOTOCONDUCTIVE COPY SHEET COMPRISING A METAL LAYER UPON WHICH HAS BEEN BONDED THERETO A PHOTOCONDUCTIVE LAYER CONTAINING A PHOTOCONDUCTOR AND CONTAINING AT LEAST ONE ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC DYES AND OXIDATION-REDUCTION INDICATORS WHICH UNDERGOES A CHANGE IN COLOR WHEN SUBJECTED TO A HIGH POTENTIAL NEGATIVE ION BOMBARDMENT TO PRODUCE A DIFFERENTIAL CONDCTIVE PATTERN COMPRISING RELATIVELY NON-CON DUCTIVE AND RELATIVELY CONDUCTIVE AREAS ON THE SURFACE THEREOF CORRESPONDING TO SAID GRAPHIC ORIGINAL, ESTABLISHING A HIGH POTENTIAL GRADIENT BETWEEN SAID COPY SHEET CONTAINING SAID DIFFERENTIAL CONDUCTIVE PATTERN AND A NEGATIVE CORONA ELECTRODE IN THE PRESENCE OF AN IONIZABLE ATMOSPHERE, SAID ELECTRODE BEING POSITIONED FROM SAID COPY SHEET SUCH THAT THE CONDUCTIVE AREAS OF SAID COPY SHEET ARE BOMBARDED WITH NEGATIVELY-CHARGED NORMALLY GASEOUS IONS, AND CONTINUING SAID BOMBARDMENT OF SAID COPY SHEET WITH SAID NEGATIVELY-CHARGED NORMALLY GASEOUS IONS FOR A SUFFICIENT LENGTH OF TIME TO PRODUCE A VISIBLE REPRODUCTION OF SAID GRAPHIC ORIGINAL UPON THE SURFACE OF SAID COPY SHEET AS THE RESULT OF THE COLOR CHANGE OF THE AFORESAID ORGANIC COMPOUND ASSOCIATED WITH SAID PHOTOCONDUCTIVE LAYER.
Claim 2
Independent Claim
193 words
A METHOD FOR REPRODUCTION OF A GRAPHIC ORIGINAL COMPRISING PROJECTING THE GRAPHIC ORIGINAL UPON A PHOTOCONDUCTIVE COPY SHEET COMPRISING A METAL LAYER UPON WHICH HAS BEEN BONDED THERETO A PHOTOCONDUCTIVE LAYER CONTAINING A PHOTOCONDUCTOR AND CONTAINING AT LEAST ONE ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC DYES AND OXIDATION-REDUCTION INDICATORS WHICH UNDERGOES A CHANGE IN COLOR WHEN SUBJECTED TO A HIGH POTENTIAL NEGATIVE ION BOMBARDMENT TO PRODUCE A DIFFERENTIAL CONDCTIVE PATTERN COMPRISING RELATIVELY NON-CON DUCTIVE AND RELATIVELY CONDUCTIVE AREAS ON THE SURFACE THEREOF CORRESPONDING TO SAID GRAPHIC ORIGINAL, ESTABLISHING A HIGH POTENTIAL GRADIENT BETWEEN SAID COPY SHEET CONTAINING SAID DIFFERENTIAL CONDUCTIVE PATTERN AND A NEGATIVE CORONA ELECTRODE IN THE PRESENCE OF AN IONIZABLE ATMOSPHERE, SAID ELECTRODE BEING POSITIONED FROM SAID COPY SHEET SUCH THAT THE CONDUCTIVE AREAS OF SAID COPY SHEET ARE BOMBARDED WITH NEGATIVELY-CHARGED NORMALLY GASEOUS IONS, AND CONTINUING SAID BOMBARDMENT OF SAID COPY SHEET WITH SAID NEGATIVELY-CHARGED NORMALLY GASEOUS IONS FOR A SUFFICIENT LENGTH OF TIME TO PRODUCE A VISIBLE REPRODUCTION OF SAID GRAPHIC ORIGINAL UPON THE SURFACE OF SAID COPY SHEET AS THE RESULT OF THE COLOR CHANGE OF THE AFORESAID ORGANIC COMPOUND ASSOCIATED WITH SAID PHOTOCONDUCTIVE LAYER.
References Cited (Backward Citations)
US2692178A
Cited
US2692948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |