US3378645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recorded dielectric medium and recording and playback methods and apparatuses
Assignee: Applied Devices Corp
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Filing: 1964-09-29
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Granted: 1968-04-16
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Expires: 1984-09-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph I Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:57
CPC Classifications
G; G11; G11B; G11B9/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD FOR RECORDING AND REPRODUCING AN INFORMATION SIGNAL COMPRISING THE STEPS OF: (A) PROVIDING A DIELECTRIC CARRIER; (B) ELECTROSTATICALLY CHARGING SUCCESSIVE AREAS ON THE CARRIER IN ACCORDANCE WITH AN INFORMATION SIGNAL; (C) DEPOSITING QUANTITIES OF POWDER DIELECTRIC PARTICLES ON THE SUCCESSIVE AREAS OF A FACE OF THE CARRIER AS A FUNCTION OF THE CHANGE IN INTENSITY OF THE ELECTROSTATIC CHARGES ON THE SUCCESSIVE AREAS WHILE LEAVING THE OTHER FACE OF THE CARRIER DEPOSIT-FREE; (D) SUPERPOSING AN ELECTRICALLY CONDUCTIVE LAYER OVER THE PARTICLE-BEARING FACE OF THE CARRIER; (E) FEEDING THE RECORDED DIELECTRIC MEDIUM THUS FORMED THROUGH A PATH OF TRAVEL BY A PAIR OF SIDE-BY-SIDE SPACED ELECTRODES CONSTITUTING WITH THE MEDIUM TWIN CONTINUOUSLY VARIABLE CAPACITORS, SAID ELECTRODES BE-
Claim 2
Independent Claim
118 words
A METHOD FOR RECORDING AND REPRODUCING AN INFORMATION SIGNAL COMPRISING THE STEPS OF: (A) PROVIDING A DIELECTRIC CARRIER; (B) ELECTROSTATICALLY CHARGING SUCCESSIVE AREAS ON THE CARRIER IN ACCORDANCE WITH AN INFORMATION SIGNAL; (C) DEPOSITING QUANTITIES OF POWDER DIELECTRIC PARTICLES ON THE SUCCESSIVE AREAS OF A FACE OF THE CARRIER AS A FUNCTION OF THE CHANGE IN INTENSITY OF THE ELECTROSTATIC CHARGES ON THE SUCCESSIVE AREAS WHILE LEAVING THE OTHER FACE OF THE CARRIER DEPOSIT-FREE; (D) SUPERPOSING AN ELECTRICALLY CONDUCTIVE LAYER OVER THE PARTICLE-BEARING FACE OF THE CARRIER; (E) FEEDING THE RECORDED DIELECTRIC MEDIUM THUS FORMED THROUGH A PATH OF TRAVEL BY A PAIR OF SIDE-BY-SIDE SPACED ELECTRODES CONSTITUTING WITH THE MEDIUM TWIN CONTINUOUSLY VARIABLE CAPACITORS, SAID ELECTRODES BE-
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) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |