Patent US3234018A successfully refreshed from Google Patents.
US3234018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for developing copies using electrophotographic layers
Assignee: Lumoprint Zindler KG and Co GmbH
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Filing: 1961-03-08
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Granted: 1966-02-08
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Expires: 1981-03-08
Abstract
No abstract record available.
Inventors
- 👤 Wendt Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:05
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/48; G; G03; G03D; G03D13/00; G03D13/002; G03G; G03G13/00; G03G13/06; G03G15/00; G03G15/06; G03G15/22; G03G15/28; G03G15/30; G03G9/00; G03G9/08; G03G9/09; G03G9/0926; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE METHOD OF MAKING A COPY FROM AN ELECTROSTATIC LATENT IMAGE PRODUCED IN AN ELECTROPHOTOGRAPHIC LAYER, IN WHICH THE ELECTROPHOTOGRAPHIC LAYER IS BROUGHT INTO CONTACT BY PRESSURE WITH A SECOND LAYER CONTAINING DEVELOPER SUBSTANCES WHICH WHEN SUBJECTED TO HEAT REACT WITH SAID ELECTROPHOTOGRAPHIC LAYER AND THE LATENT IMAGE THEREIN, EXPOSING SAID CONTACTING LAYERS TO A SOURCE OF HEAT RAYS TO PRODUCE SAID REACTION IN SAID SECOND LAYER, WHEREBY SAID DEVELOPER SUBSTANCES BECOME ACTIVE IN ACCORDANCE WITH THE DIFFERENTIAL HEAT CONDUCTIVITY THROUGHOUT SAID ELECTROPHOTOGRAPHIC LAYER IS DETERMINED BY THE LATENT IMAGE THEREIN SO AS TO FORM A COPY OF THE LATTER, AND THEN SEPARATING SAID ELECTROPHOTOGRAPHIC LAYER FROM SAID SECOND LAYER WHICH LATER CARRIES NOW A VISIBLE IMAGE.
Claim 2
Independent Claim
117 words
THE METHOD OF MAKING A COPY FROM AN ELECTROSTATIC LATENT IMAGE PRODUCED IN AN ELECTROPHOTOGRAPHIC LAYER, IN WHICH THE ELECTROPHOTOGRAPHIC LAYER IS BROUGHT INTO CONTACT BY PRESSURE WITH A SECOND LAYER CONTAINING DEVELOPER SUBSTANCES WHICH WHEN SUBJECTED TO HEAT REACT WITH SAID ELECTROPHOTOGRAPHIC LAYER AND THE LATENT IMAGE THEREIN, EXPOSING SAID CONTACTING LAYERS TO A SOURCE OF HEAT RAYS TO PRODUCE SAID REACTION IN SAID SECOND LAYER, WHEREBY SAID DEVELOPER SUBSTANCES BECOME ACTIVE IN ACCORDANCE WITH THE DIFFERENTIAL HEAT CONDUCTIVITY THROUGHOUT SAID ELECTROPHOTOGRAPHIC LAYER IS DETERMINED BY THE LATENT IMAGE THEREIN SO AS TO FORM A COPY OF THE LATTER, AND THEN SEPARATING SAID ELECTROPHOTOGRAPHIC LAYER FROM SAID SECOND LAYER WHICH LATER CARRIES NOW A VISIBLE IMAGE.
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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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |