US3670203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for imparting an electrical charge to a web of film or paper or the like
Assignee: Eastman Kodak Co
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Filing: 1970-04-20
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Granted: 1972-06-13
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Expires: 1990-04-20
Abstract
Abstract An electrical charge is applied to a moving web of flexible material such as film or paper by transporting the web over a grounded roller while maintaining a stationary electrically charged plate adjacent to the web but spaced slightly therefrom. A direct current voltage of the required sign and magnitude is applied to the plate from any suitable source such as a generator or battery. Alternatively the plate can be grounded and the voltage applied to the roller.
Inventors
- 👤 Thomas C Whitmore Jr
- 👤 Robert G Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0266; H; H05; H05F; H05F3/00; H05F3/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
In an apparatus for developing a predetermined electrical charge condition on a transported flexible web, the combination comprising: means for transporting a web in a transport system of one or more conducting rollers; first electrically conductive means of said transport system for supporting one surface of the web; second electrically conductive means spaced from said first conductive means and between which the web is transported by said web transporting means; means for grounding one of said first and second conductive means; adjustable means for applying a direct current voltage of a selected magnitude and sign to the other of said first and second conductive means for generating an electrostatic field without generating a corona discharge; means adjacent said first and second conductive means for monitoring the electrical charge on the web; and means for adjusting said adjustable means in response to said monitoring means for generating a predetermined electrostatic field between said first and second conductive means for developing a predetermined electrical charge condition on the web.
Claim 2
Dependent Claim
167 words
In an apparatus for developing a predetermined electrical charge condition on a transported flexible web, the combination comprising: means for transporting a web in a transport system of one or more conducting rollers; first electrically conductive means of said transport system for supporting one surface of the web; second electrically conductive means spaced from said first conductive means and between which the web is transported by said web transporting means; means for grounding one of said first and second conductive means; adjustable means for applying a direct current voltage of a selected magnitude and sign to the other of said first and second conductive means for generating an electrostatic field without generating a corona discharge; means adjacent said first and second conductive means for monitoring the electrical charge on the web; and means for adjusting said adjustable means in response to said monitoring means for generating a predetermined electrostatic field between said first and second conductive means for developing a predetermined electrical charge condition on the web.
Claim 3
Dependent Claim
33 words
The invention according to claim 1 wherein said first conductive means comprises a roller, and said second conductive means comprises an arcuate plate having a surface concentric with and spaced from said roller.
Claim 4
Dependent Claim
62 words
The invention according to claim 1 wherein said first conductive means comprises a grounded roller, said second conductive means comprises an arcuate plate having a surface concentric with and spaced from said roller and electrically connected to said adjustable direct current voltage applying means, and said monitoring means is positioned to monitor the charge on the web after it leaves the roller.
Claim 5
Independent Claim
110 words
A method of developing a predetermined electrical charge condition on a flexible light-sensitive web material transported over a transport system of one or more conducting rollers, comprising the steps of: transporting the web through opposed, spaced apart first and second conductive members, one of which is grounded, and one of which is engaged by one side of the web; monitoring the electrical charge on the web; and in response to the monitoring, applying a direct current voltage of a selected magnitude and sign to the ungrounded conductive member for generating a predetermined electrostatic field between said first and second conductive members developing a predetermined electrical charge condition on the web.
Claim 6
Independent Claim
110 words
A method of developing a predetermined electrical charge condition on a flexible light-sensitive web material transported over a transport system of one or more conducting rollers, comprising the steps of: transporting the web through opposed, spaced apart first and second conductive members, one of which is grounded, and one of which is engaged by one side of the web; monitoring the electrical charge on the web; and in response to the monitoring, applying a direct current voltage of a selected magnitude and sign to the ungrounded conductive member for generating a predetermined electrostatic field between said first and second conductive members developing a predetermined electrical charge condition on the web.
References Cited (Backward Citations)
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |