US3438706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic device
Assignee: Canon Inc
•
Filing: 1966-10-07
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Granted: 1969-04-15
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Expires: 1986-10-07
Abstract
No abstract record available.
Inventors
- 👤 Hiroshi Tanaka
- 👤 Shinkichi Takahashi
- 👤 Tetsuo Hasegawa
- 👤 Toshihiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:11
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/10; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/22; G03G15/28; G03G15/283; G03G15/286; G03G15/30; G03G21/0005; G03G21/0011; G03G21/0017; G03G21/0023; G03G21/0029
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN ELECTROPHOTOGRAPHIC COPYING DEVICE WHICH COMPRISES: CHARGING MEANS FOR APPLYING A PRIMARY CHARGE ON THE SURFACE OF A PHOTOSENSITIVE PLATE, WHICH PLATE COMPRISES A BASE, A PHOTOCONDUCTIVE LAYER AND A TRANSLUCENT INSULATING LAYER OVERLAID THEREON; MEANS FOR SIMULTANEOUSLY EXPOSING AN ORIGINAL IMAGE AND FOR APPLYING A CORONA DISCHARGE ON THE SURFACE OF SAID CHARGED INSULATING LAYER, MEANS FOR FORMING A HIGH CONTRAST STATIC IMAGE OF THE ORIGINAL IMAGE ON THE SURFACE OF SAID INSULATING LAYER BY UNIFORMLY IRRADIATING THE WHOLE SURFACE OF SAID INSULATING LAYER, THEREBY ACTIVATING THE PHOTOCONDUCTIVE LAYER; DEVELOPING MEANS FOR VISUALIZING SAID STATIC LATENT IMAGE; MEANS FOR TRANSMITTING SAID VISUALIZED IMAGE ONTO COPYING MATERIAL; AND CLEANING MEANS FOR REMOVING RESIDUAL DEVELOPER FROM THE SURFACE OF SAID INSULATING LAYER REMAINING AFTER THE TRANSFER OF THE IMAGE, WHEREBY THE PHOTOSENSITIVE PLATE IS PREPARED FOR REPEATED USE.
Claim 2
Dependent Claim
137 words
AN ELECTROPHOTOGRAPHIC COPYING DEVICE WHICH COMPRISES: CHARGING MEANS FOR APPLYING A PRIMARY CHARGE ON THE SURFACE OF A PHOTOSENSITIVE PLATE, WHICH PLATE COMPRISES A BASE, A PHOTOCONDUCTIVE LAYER AND A TRANSLUCENT INSULATING LAYER OVERLAID THEREON; MEANS FOR SIMULTANEOUSLY EXPOSING AN ORIGINAL IMAGE AND FOR APPLYING A CORONA DISCHARGE ON THE SURFACE OF SAID CHARGED INSULATING LAYER, MEANS FOR FORMING A HIGH CONTRAST STATIC IMAGE OF THE ORIGINAL IMAGE ON THE SURFACE OF SAID INSULATING LAYER BY UNIFORMLY IRRADIATING THE WHOLE SURFACE OF SAID INSULATING LAYER, THEREBY ACTIVATING THE PHOTOCONDUCTIVE LAYER; DEVELOPING MEANS FOR VISUALIZING SAID STATIC LATENT IMAGE; MEANS FOR TRANSMITTING SAID VISUALIZED IMAGE ONTO COPYING MATERIAL; AND CLEANING MEANS FOR REMOVING RESIDUAL DEVELOPER FROM THE SURFACE OF SAID INSULATING LAYER REMAINING AFTER THE TRANSFER OF THE IMAGE, WHEREBY THE PHOTOSENSITIVE PLATE IS PREPARED FOR REPEATED USE.
References Cited (Backward Citations)
US3071645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |