US3810193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bitting card for data recording
Assignee: SECRETARY DEPARTMENT OF SUPPLY AU
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Filing: 1969-09-30
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Granted: 1974-05-07
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Expires: 1989-09-30
Abstract
Abstract A method of data recording on bitting cards or sheets or other material which consists in traversing the material with a recording element on which is impressed an electrical signal which does not exceed 70 volts, the surface on which the recording takes place having a bulk resistivity not exceeding 1016 ohm cm.2 whereby to avoid holding of unwanted electrical characteristics on the sheet and whereby recording takes place without corona or gas effects present when high voltage is used, and then developing the resultant image to produce a permanent recoverable record of the impressed signal.
Inventors
- 👤 K Metcalfe
- 👤 I Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:41
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/325; G06; G06K; G06K1/00; G06K1/12; G06K1/128; G06K19/00; G06K19/02; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A method of recording data on bitting cards or materials comprising forming the material with a photoconductive polarizable surface having a bulk resistivity less than 1013 ohm cm2, and a backing for the polarizable surface having a relatively greater conductivity, transversing the material with a modulated signal the voltage of which does not exceed seventy volts, the voltage being applied to a stylus in contact with the surface whereby the stylus produces a latent signal image on the surface, and developing the said image with a liquid developer comprising an electrically insulating carrier liquid in which is dispersed a medium attractable to the latent image, the signal being applied by the stylus when in contact with the said surface and in the presence of the developer liquid which wets the surface at the point of stylus contact.
Claim 2
Independent Claim
137 words
A method of recording data on bitting cards or materials comprising forming the material with a photoconductive polarizable surface having a bulk resistivity less than 1013 ohm cm2, and a backing for the polarizable surface having a relatively greater conductivity, transversing the material with a modulated signal the voltage of which does not exceed seventy volts, the voltage being applied to a stylus in contact with the surface whereby the stylus produces a latent signal image on the surface, and developing the said image with a liquid developer comprising an electrically insulating carrier liquid in which is dispersed a medium attractable to the latent image, the signal being applied by the stylus when in contact with the said surface and in the presence of the developer liquid which wets the surface at the point of stylus contact.
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |