Patent US3303486A successfully refreshed from Google Patents.
US3303486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital frequency shift magnetic recording system
Assignee: Ampex Corp
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Filing: 1963-11-12
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Granted: 1967-02-07
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Ronald E Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:12
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A METHOD OF RECORDING AND REPRODUCING DIGITAL DATA IN AN ANALOG TYPE TAPE RECORDING SYSTEM, SAID METHOD COMPRISING THE STEPS OF: GENERATING A FIRST AND A SECOND VOLTAGE LEVEL SIGNAL REPRESENTATIVE OF A BINARY "1" AND "0" DIGIT RESPECTIVELY; INTRODUCING THE FIRST AND SECOND VOLTAGE LEVEL SIGNALS TO A SINGLE VOLTAGE CONTROLLED OSCILLATOR HAVING A FIRST AND A SECOND OPERATING STATE; GENERATING A FIRST FREQUENCY SIGNAL BY DRIVING THE OSCILLATOR TO THE FIRST STATE IN RESPONSE TO EACH OF SAID BINARY "1" DIGITS REPRESENTED BY SAID FIRST VOLTAGE LEVEL SIGNALS INTRODUCED THERETO; GENERATING A SECOND FREQUENCY SIGNAL BY DRIVING THE OSCILLATOR TO THE SECOND STATE IN RESPONSE TO EACH OF SAID BINARY "0" DIGITS REPRESENTED BY SAID SECOND VOLTAGE LEVEL SIGNALS INTRODUCED THERETO; DIVIDING THE FREQUENCY OF THE FIRST AND SECOND FREQUENCY SIGNALS BY A FACTOR RELATED TO THE TAPE SPEED; RECORDING AT LEAST ONE CYCLE OF EITHER SAID FIRST OR SECOND DIVIDED FREQUENCY SIGNALS FOR EACH OF SAID BINARY DIGITS RESPECTIVELY AT SUCH TIME AS EITHER THE FIRST OR THE SECOND VOLTAGE LEVEL SIGNALS ARE INTRODUCED TO THE OSCILLATOR; AND SENSING AND FILTERING SAID FIRST AND SECOND RECORDED SIGNALS TO RESPECTIVELY DEVELOP FIRST AND SECOND OUTPUT SIGNALS IN RESPONSE THERETO.
Claim 2
Independent Claim
201 words
A METHOD OF RECORDING AND REPRODUCING DIGITAL DATA IN AN ANALOG TYPE TAPE RECORDING SYSTEM, SAID METHOD COMPRISING THE STEPS OF: GENERATING A FIRST AND A SECOND VOLTAGE LEVEL SIGNAL REPRESENTATIVE OF A BINARY "1" AND "0" DIGIT RESPECTIVELY; INTRODUCING THE FIRST AND SECOND VOLTAGE LEVEL SIGNALS TO A SINGLE VOLTAGE CONTROLLED OSCILLATOR HAVING A FIRST AND A SECOND OPERATING STATE; GENERATING A FIRST FREQUENCY SIGNAL BY DRIVING THE OSCILLATOR TO THE FIRST STATE IN RESPONSE TO EACH OF SAID BINARY "1" DIGITS REPRESENTED BY SAID FIRST VOLTAGE LEVEL SIGNALS INTRODUCED THERETO; GENERATING A SECOND FREQUENCY SIGNAL BY DRIVING THE OSCILLATOR TO THE SECOND STATE IN RESPONSE TO EACH OF SAID BINARY "0" DIGITS REPRESENTED BY SAID SECOND VOLTAGE LEVEL SIGNALS INTRODUCED THERETO; DIVIDING THE FREQUENCY OF THE FIRST AND SECOND FREQUENCY SIGNALS BY A FACTOR RELATED TO THE TAPE SPEED; RECORDING AT LEAST ONE CYCLE OF EITHER SAID FIRST OR SECOND DIVIDED FREQUENCY SIGNALS FOR EACH OF SAID BINARY DIGITS RESPECTIVELY AT SUCH TIME AS EITHER THE FIRST OR THE SECOND VOLTAGE LEVEL SIGNALS ARE INTRODUCED TO THE OSCILLATOR; AND SENSING AND FILTERING SAID FIRST AND SECOND RECORDED SIGNALS TO RESPECTIVELY DEVELOP FIRST AND SECOND OUTPUT SIGNALS IN RESPONSE THERETO.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |