US3776132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Falling developer curtain printing and coating
Assignee: Continental Can Co Inc
•
Filing: 1971-02-01
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Granted: 1973-12-04
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Expires: 1991-02-01
Abstract
Abstract Method and apparatus for creating a falling curtain of toner adjacent to a vertically disposed stencil screen for printing or coating a vertically disposed surface of a substrate. By creating the falling curtain between a pair of spaced stencil screens, two substrates can be simultaneously coated or printed. Non-planar objects can be printed or coated by providing a non-planar stencil screen.
Inventors
- 👤 K Rarey
- 👤 J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:00
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/12; B41M1/125; B41F; B41F15/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A method of electrostatically printing or coating a substrate comprising the steps of providing a stencil screen and a substrate, said stencil screen being of the type having openings therein for defining a desired pattern, placing said stencil screen and said substrate in a substantially vertically disposed orientation adjacent to each other, creating a substantially vertical free falling curtain of toner in a space adjacent to said stencil screen on the side thereof remote from said substrate and along the full extent of said openings, creating a substantially horizontally directed electric field in said space for causing some of said toner to pass through said openings in said stencil screen and impinge upon said substrate, providing a second stencil screen and a second substrate, placing said second stencil screen in spaced relation to the first-mentioned stencil screen and placing said second substrate adjacent said second stencil screen on the side thereof remote from said firstmentioned stencil screen, and creating said falling curtain of toner so that it falls in the space between said first-mentioned stencil screen and said second stencil screen.
Claim 2
Independent Claim
181 words
A method of electrostatically printing or coating a substrate comprising the steps of providing a stencil screen and a substrate, said stencil screen being of the type having openings therein for defining a desired pattern, placing said stencil screen and said substrate in a substantially vertically disposed orientation adjacent to each other, creating a substantially vertical free falling curtain of toner in a space adjacent to said stencil screen on the side thereof remote from said substrate and along the full extent of said openings, creating a substantially horizontally directed electric field in said space for causing some of said toner to pass through said openings in said stencil screen and impinge upon said substrate, providing a second stencil screen and a second substrate, placing said second stencil screen in spaced relation to the first-mentioned stencil screen and placing said second substrate adjacent said second stencil screen on the side thereof remote from said firstmentioned stencil screen, and creating said falling curtain of toner so that it falls in the space between said first-mentioned stencil screen and said second stencil screen.
Claim 3
Dependent Claim
33 words
The method defined in claim 1 including the step of electrically charging said first-mentioned stencil screen and said second stencil screen to different potentials for creating an electric field in the space therebetween.
Claim 4
Dependent Claim
24 words
The method defined in claim 2 including the step of reversing the respective potentials of said first-mentioned stencil screen and said second stencil screen.
Claim 5
Dependent Claim
25 words
The method defined in claim 2 including the step of creating additional electric fields in the spaces between the respective stencil screens and adjacent substrates.
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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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |