US3828670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for electrostatic printing using triboelectric inking developers
Assignee: Continental Can Co Inc
•
Filing: 1970-02-17
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Granted: 1974-08-13
•
Expires: 1990-02-17
Abstract
Abstract An electrostatic coating and printing process and apparatus wherein electrically conductive carrier particles and electrically non-conductive toner particles are actuated by an electric field to cause at least some of the carrier particles and toner particles to impinge upon a substrate for applying a selective coating thereto. A stencil screen may be interposed along the path of movement of the particles such that the substrate is coated in a pattern defined by apertures in the stencil screen.
Inventors
- 👤 J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:30
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/12; B41M1/125; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
An electrostatic process for applying a selective coating to a substrate comprising the steps of mixing electrically conductive carrier particles with electrically non-conductive toner particles so that the toner particles triboelectrically adhere to the carrier particles, placing said carrier particles and toner particles in a space between said substrate and a base electrode spaced therefrom with said carrier particles being in electrical contact with said base electrode, and establishing an electric field in the space between said substrate and said base electrode for moving said carrier particles and toner particles toward said substrate.
Claim 2
Dependent Claim
93 words
An electrostatic process for applying a selective coating to a substrate comprising the steps of mixing electrically conductive carrier particles with electrically non-conductive toner particles so that the toner particles triboelectrically adhere to the carrier particles, placing said carrier particles and toner particles in a space between said substrate and a base electrode spaced therefrom with said carrier particles being in electrical contact with said base electrode, and establishing an electric field in the space between said substrate and said base electrode for moving said carrier particles and toner particles toward said substrate.
Claim 3
Dependent Claim
44 words
An electrostatic process as defined in claim 1 including the step of obstructing the motion of some of said carrier particles and some of said toner particles, and causing the remaining carrier particles and toner particles to continue toward and impinge upon said substrate.
Claim 4
Dependent Claim
45 words
An electrostatic process as defined in claim 2 wherein said step of obstructing the motion of some of said carrier particles and some of said toner particles includes the step of interposing an apertured screen in the space between said base electrode and said substrate.
Claim 5
Dependent Claim
97 words
Apparatus for coating a substrate with a selective coating of particles, said apparatus comprising a pair of spaced electrodes, a developer mixture comprised of electrically conductive carrier particles and electrically non-conductive toner particles triboelectrically adhered together and located in the space between said electrodes with said carrier particles being in electrical contact with one of said electrodes, an apertured screen interposed between said developer mixture and the other of said electrodes, and a power source connected across said electrodes for creating an electric field therebetween for moving said carrier particles and toner particles toward said apertured screen.
Claim 6
Dependent Claim
97 words
Apparatus for coating a substrate with a selective coating of particles, said apparatus comprising a pair of spaced electrodes, a developer mixture comprised of electrically conductive carrier particles and electrically non-conductive toner particles triboelectrically adhered together and located in the space between said electrodes with said carrier particles being in electrical contact with one of said electrodes, an apertured screen interposed between said developer mixture and the other of said electrodes, and a power source connected across said electrodes for creating an electric field therebetween for moving said carrier particles and toner particles toward said apertured screen.
Claim 7
Dependent Claim
12 words
Apparatus as in claim 4 wherein said other electrode is a substrate.
Claim 8
Dependent Claim
14 words
Apparatus as in claim 4 wherein said screen is comprised of electrically non-conductive material.
Claim 9
Dependent Claim
31 words
Apparatus as in claim 4 wherein said apertured screen has openings therethrough for defining a pattern, said openings being large enough to allow passage of carrier particles and toner particles therethrough.
Claim 10
Dependent Claim
28 words
Apparatus as in claim 4 wherein said substrate is comprised of electrically non-conductive material, said substrate being located between said apertured screen and said other of said electrodes.
Claim 11
Dependent Claim
31 words
Apparatus as in claim 8 wherein said apertured screen has openings therein for defining a pattern, said openings being large enough to allow passage of carrier particles and toner particles therethrough.
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |