Patent US3307940A successfully refreshed from Google Patents.
US3307940A
Expired / Lapsed
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Electrophotographic process employing photoconductive polymers
Assignee: Azoplate Corp
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Filing: 1960-05-23
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Granted: 1967-03-07
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Expires: 1980-05-23
Abstract
No abstract record available.
Inventors
- 👤 Hoegl Helmut
- 👤 Schlesinger Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:55
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/56; C07D209/80; C07D209/82; C07D209/88; C07D239/00; C07D239/70; C07D239/72; C07D239/74; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/62; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0609; G03G5/07; G03G5/071; G03G5/072; G03G5/073; G03G5/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING AN ELECTROSTATICALLY CHARGED SUPPORTED PHOTOCONDUCTIVE INSULATING LAYER TO LIGHT UNDER A MASTER AND DEVELOPING THE RESULTING IMAGE WITH AN ELECTROSCOPIC MATERIAL, THE PHOTOCONDUCTIVE LAYER COMPRISING A POLYMER HAVING THE FORMULA
Claim 2
Dependent Claim
37 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING AN ELECTROSTATICALLY CHARGED SUPPORTED PHOTOCONDUCTIVE INSULATING LAYER TO LIGHT UNDER A MASTER AND DEVELOPING THE RESULTING IMAGE WITH AN ELECTROSCOPIC MATERIAL, THE PHOTOCONDUCTIVE LAYER COMPRISING A POLYMER HAVING THE FORMULA
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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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |