Patent US3280270A successfully refreshed from Google Patents.
US3280270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination direct/fm record and reproduce system
Assignee: Ampex Corp
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Filing: 1962-03-30
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Granted: 1966-10-18
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Expires: 1982-03-30
Abstract
No abstract record available.
Inventors
- 👤 Robert W Allington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A RECORDING AND REPRODUCING SYSTEM COMPRISING: MEANS FOR SUPPLYING AN INFORMATION INPUT SIGNAL; A SINGLE RECORD HEAD; A DIRECT RECORD CHANNEL COUPLED BETWEEN SAID INPUT SIGNAL SUPPLYING MEANS AND SAID RECORD HEAD; A FREQUENCY MODULATION RECORD CHANNEL COUPLED BETWEEN SAID INPUT SIGNAL SUPPLYING MEANS AND SAID RECORD HEAD, SAID CHANNELS BEING CONNECTED IN PARALLEL; MEANS FOR APPLYING A BIAS SIGNAL TO SUCH RECORD HEAD; A SINGLE REPRODUCE HEAD; A UTILIZATION CIRCUIT; A DIRECT RECORD REPRODUCE CHANNEL COUPLED BETWEEN SAID REPRODUCE HEAD AND SAID UTILIZATION CIRCUIT; A FREQUENCY MODULATION REPRODUCE CHANNEL COUPLED BETWEEN SAID REPRODUCE HEAD AND SAID UTILIZATION CIRCUIT; AND A SWITCHING ELEMENT FOR SELECTING EITHER THE DIRECT RECORD OR FREQUENCY MODULATION CHANNELS FOR CONNECTION TO SAID RECORD AND REPRODUCE HEADS TO CONDUCT A RECORDING AND REPRODUCING OPERATION.
Claim 2
Dependent Claim
128 words
A RECORDING AND REPRODUCING SYSTEM COMPRISING: MEANS FOR SUPPLYING AN INFORMATION INPUT SIGNAL; A SINGLE RECORD HEAD; A DIRECT RECORD CHANNEL COUPLED BETWEEN SAID INPUT SIGNAL SUPPLYING MEANS AND SAID RECORD HEAD; A FREQUENCY MODULATION RECORD CHANNEL COUPLED BETWEEN SAID INPUT SIGNAL SUPPLYING MEANS AND SAID RECORD HEAD, SAID CHANNELS BEING CONNECTED IN PARALLEL; MEANS FOR APPLYING A BIAS SIGNAL TO SUCH RECORD HEAD; A SINGLE REPRODUCE HEAD; A UTILIZATION CIRCUIT; A DIRECT RECORD REPRODUCE CHANNEL COUPLED BETWEEN SAID REPRODUCE HEAD AND SAID UTILIZATION CIRCUIT; A FREQUENCY MODULATION REPRODUCE CHANNEL COUPLED BETWEEN SAID REPRODUCE HEAD AND SAID UTILIZATION CIRCUIT; AND A SWITCHING ELEMENT FOR SELECTING EITHER THE DIRECT RECORD OR FREQUENCY MODULATION CHANNELS FOR CONNECTION TO SAID RECORD AND REPRODUCE HEADS TO CONDUCT A RECORDING AND REPRODUCING OPERATION.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |