Patent US3784398A successfully refreshed from Google Patents.
US3784398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transferring recorded signals and latent electrostatic images before development
Assignee: Department of Supply
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Filing: 1971-08-16
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Granted: 1974-01-08
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Expires: 1991-08-16
Abstract
Abstract The invention relates to a method of and means for transferring recorded signals and latent electrostatic images before development. The insulating medium which is placed over the photoconductor surface is so constructed that the dielectric constant or permittivity on one side is lower than the dielectric constant on the other side. This can be achieved by forming the insulating medium of a laminate of two differing materials of differing dielectric constants.
Inventors
- 👤 K Metcalfe
- 👤 A Clements
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:28
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0211; G03G13/00; G03G13/14; G03G13/18; G03G5/0208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
The method of claim 1 wherein the two layers have a dielectric constant difference substantially in the ratio of 1 to 2.
Claim 2
Dependent Claim
35 words
The method of claim 1 wherein the image receiving layer has a dielectric constant between 2 and 4 and the backing layer has a dielectric constant of approximately twice that of the image receiving layer.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |