US4443093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing method
Assignee: Fujifilm Business Innovation Corp
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Filing: 1982-09-07
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Granted: 1984-04-17
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Expires: 2002-09-07
Abstract
Abstract In an electrostatic printing method of the type wherein a toner image is fixed on a printing master, the master is repeatedly run through a charging operation with a discharging lamp or the like maintained off, until the potential thereof reaches a value approximating a practical printing value. The lamp is then turned on and the master again repeatedly charged until the practical value is reached, prior to using the master for printing.
Inventors
- 👤 Masaki Yoshino
- 👤 Kozo Oka
- 👤 Huminori Koide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:17
CPC Classifications
G; G03; G03G; G03G13/00; G03G15/00; G03G15/22; G03G15/228; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
An electrostatic printing method, comprising; forming a printing master having a fixed toner image on a photo-conductive plate; repeatedly charging said printing master with a light source maintained off until a potential from 0.7 to 1.3 times a practical potential is given thereto, and then charging said printing master with said light source turned on, to thereby recover an image region potential of said printing master; and printing using said printing master.
Claim 2
Dependent Claim
72 words
An electrostatic printing method, comprising; forming a printing master having a fixed toner image on a photo-conductive plate; repeatedly charging said printing master with a light source maintained off until a potential from 0.7 to 1.3 times a practical potential is given thereto, and then charging said printing master with said light source turned on, to thereby recover an image region potential of said printing master; and printing using said printing master.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1, said practical value comprising a saturation value of said printing master when charging with said light maintained on.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 1, said light source comprising a discharging lamp.
Claim 5
Dependent Claim
15 words
A method as claimed in claim 1, said light source comprising a uniform exposure lamp.
Claim 6
Dependent Claim
21 words
A method as claimed in claim 1, said toner image on said printing master being fixed by application of infrared radiation.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 1, said toner image on said printing master being fixed by application of flash fixing.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 1, said printing master being charged by repeatedly rotating said master past a stationary charging unit.
Claim 9
Dependent Claim
25 words
A method as claimed in claim 1, said printing master being charged to from -280 to -520 volts prior to turning on said light source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |