Patent US3936874A successfully refreshed from Google Patents.
US3936874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-format tape duplicator
Assignee: Individual
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Filing: 1973-10-11
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Granted: 1976-02-03
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Expires: 1993-10-11
Abstract
Abstract A tape duplicator having component parts capable of duplicating magnetic tape in cassette form or reel form to cassette form or reel form interchangeably without special units, having the same capstan drive to drive both the cassette and the reel tapes interchangeably, and provided with an automatic volume control which is fully compensated to adjust the volume level to the set level and which avoids excessive high volume levels in beginning recording and high noise levels during silent spots in the tapes.
Inventors
- 👤 Norman G. Dusanek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B27/00; G11B27/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
220 words
A tape duplicator capable of duplicating master tape in reel form as well as in cassette form onto a blank cassette tape and a blank reel tape simultaneously at relatively high speeds, comprising: single drive means for advancing said tapes over a playback head and recording heads, respectively; single capstan means having different diameters for producing a different speed for said cassette tape from the speed for said reel tape; audio amplifier means connected between said playback head and said recording heads, said audio amplifier means having an automatic volume control circuit comprising: input transistor means having a pre-determined base-emitter voltage; circuit means for providing a pre-determined volume level on said blank tapes for duplicating a master tape whose recorded volume level is below said pre-determined volume level and for duplicating a master tape whose recorded volume level is above said pre-determined volume level; and circuit means including a field effect transistor for maintaining constant amplifier gain while the signal input to said automatic volume control circuit remains insufficient to overcome said pre-determined base-emitter voltage of said input transistor means, thereby preventing a change in the amplifier gain until after receipt of a signal input sufficient to overcome said pre-determined base-emitter voltage of said input transistor means, whereby all of said tapes move simultaneously and in synchronization at all times.
Claim 2
Dependent Claim
220 words
A tape duplicator capable of duplicating master tape in reel form as well as in cassette form onto a blank cassette tape and a blank reel tape simultaneously at relatively high speeds, comprising: single drive means for advancing said tapes over a playback head and recording heads, respectively; single capstan means having different diameters for producing a different speed for said cassette tape from the speed for said reel tape; audio amplifier means connected between said playback head and said recording heads, said audio amplifier means having an automatic volume control circuit comprising: input transistor means having a pre-determined base-emitter voltage; circuit means for providing a pre-determined volume level on said blank tapes for duplicating a master tape whose recorded volume level is below said pre-determined volume level and for duplicating a master tape whose recorded volume level is above said pre-determined volume level; and circuit means including a field effect transistor for maintaining constant amplifier gain while the signal input to said automatic volume control circuit remains insufficient to overcome said pre-determined base-emitter voltage of said input transistor means, thereby preventing a change in the amplifier gain until after receipt of a signal input sufficient to overcome said pre-determined base-emitter voltage of said input transistor means, whereby all of said tapes move simultaneously and in synchronization at all times.
Claim 3
Dependent Claim
225 words
A tape duplicator capable of duplicating a master reel tape simultaneously onto two blank cassette tapes and a blank reel tape at relatively high speeds, comprising: single drive means for advancing said tapes over a reel playback head and two cassette recording heads and a reel recording head, respectively; single capstan means having different diameters for producing a different recording speed for said blank cassette tapes from the recording speed for said blank reel tape; audio amplifier means connected between said playback head and said recording heads, said audio amplifier means having an automatic volume control circuit comprising: input transistor means having a pre-determined base-emitter voltage; circuit means for providing a pre-determined volume level on said blank tapes for duplicating a master tape whose recorded volume level is below said pre-determined volume level and for duplicating a master tape whose recorded volume level is above said pre-determined volume level; and circuit means including a field effect transistor for maintaining constant amplifier gain while the signal input to said automatic volume control circuit remains insufficient to overcome said pre-determined base-emitter voltage of said input transistor means, thereby preventing a change in the amplifier gain until after receipt of a signal input sufficient to overcome said pre-determined base-emitter voltage of said input transistor means, whereby all of said tapes move simultaneously and in synchronization at all times.
Claim 4
Dependent Claim
225 words
A tape duplicator capable of duplicating a master reel tape simultaneously onto two blank cassette tapes and a blank reel tape at relatively high speeds, comprising: single drive means for advancing said tapes over a reel playback head and two cassette recording heads and a reel recording head, respectively; single capstan means having different diameters for producing a different recording speed for said blank cassette tapes from the recording speed for said blank reel tape; audio amplifier means connected between said playback head and said recording heads, said audio amplifier means having an automatic volume control circuit comprising: input transistor means having a pre-determined base-emitter voltage; circuit means for providing a pre-determined volume level on said blank tapes for duplicating a master tape whose recorded volume level is below said pre-determined volume level and for duplicating a master tape whose recorded volume level is above said pre-determined volume level; and circuit means including a field effect transistor for maintaining constant amplifier gain while the signal input to said automatic volume control circuit remains insufficient to overcome said pre-determined base-emitter voltage of said input transistor means, thereby preventing a change in the amplifier gain until after receipt of a signal input sufficient to overcome said pre-determined base-emitter voltage of said input transistor means, whereby all of said tapes move simultaneously and in synchronization at all times.
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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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |