US3179944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reducing noise level in electrostatic recording media
Assignee: EIDP Inc
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Filing: 1962-03-05
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Granted: 1965-04-20
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Expires: 1982-03-05
Abstract
No abstract record available.
Inventors
- 👤 John E Dickens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:04
CPC Classifications
G; G06; G06K; G06K1/00; G06K1/12; G06K1/128; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G11; G11B; G11B9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN THE PROCESS OF ELECTROSTATIC RECORDING WHEREIN THE DIELECTRIC MEDIUM IS PLACED BETWEEN A PAIR OF ELECTRODES AND IS SUBJECTED TO A VOLTAGE ACROSS THE ELECTRODES, SAID VOLTAGE BEING ABOVE THE THRESHOLD VOLTAGE FOR CURRENT FLOW TO SAID DIELECTRIC MEDIUM CORRESPONDING TO THE SIGNAL, RELATED TO A SIGNAL VOLTAGE WHEREBY A CHARGE IS IMPRESSED IN SAID DIELECTRIC MEDIUM CORRESPONDING TO THE SIGNAL, THE IMPROVEMENT FOR REDUCING THE NOISE LEVEL IN THE DIELECTRIC MEDIUM WHEREIN THE DIELECTRIC MEDIUM IS CONTACTED FIRST WITH AN ATMOSPHERE OF GASEOUS IONS AND, THEREAFTER, IS HEATED TO AN ELEVATED TEMPERATURE, BOTH STEPS BEING CARRIED OUT PRIOR TO RECORDING.
Claim 2
Dependent Claim
102 words
IN THE PROCESS OF ELECTROSTATIC RECORDING WHEREIN THE DIELECTRIC MEDIUM IS PLACED BETWEEN A PAIR OF ELECTRODES AND IS SUBJECTED TO A VOLTAGE ACROSS THE ELECTRODES, SAID VOLTAGE BEING ABOVE THE THRESHOLD VOLTAGE FOR CURRENT FLOW TO SAID DIELECTRIC MEDIUM CORRESPONDING TO THE SIGNAL, RELATED TO A SIGNAL VOLTAGE WHEREBY A CHARGE IS IMPRESSED IN SAID DIELECTRIC MEDIUM CORRESPONDING TO THE SIGNAL, THE IMPROVEMENT FOR REDUCING THE NOISE LEVEL IN THE DIELECTRIC MEDIUM WHEREIN THE DIELECTRIC MEDIUM IS CONTACTED FIRST WITH AN ATMOSPHERE OF GASEOUS IONS AND, THEREAFTER, IS HEATED TO AN ELEVATED TEMPERATURE, BOTH STEPS BEING CARRIED OUT PRIOR TO RECORDING.
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) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |