US3401231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic playback head switching apparatus
Assignee: Rank Bush Murphy Ltd
•
Filing: 1965-07-29
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Granted: 1968-09-10
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Expires: 1985-07-29
Abstract
No abstract record available.
Inventors
- 👤 Baldwin John Lewis Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:40
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
MAGNETIC RECORD PLAYBACK APPARATUS COMPRISING IN COMBINATION: A MAGNETIC TAPE HAVING A SIGNAL RECORDED THEREON IN A SUCCESSION OF INDIVIDUAL RECORD TRACKS; A ROTATABLE MEMBER; A PLURALITY OF SIGNAL TRANSDUCER HEADS SPACED ABOUT THE PERIPHERY OF SAID MEMBER; DRIVE MEANS OPERABLE TO DRIVE SAID MEMBER AT A PREDETERMINED SPEED OF ROTATION; GUIDE MEANS PRESENTING SAID TAPE FOR ENGAGEMENT WITH SAID MEMBER WHEREBY SAID HEADS ENGAGE SAID RECORD TRACKS IN A CYCLIC SEQUENCE HAVING A PREDETERMINED FREQUENCY; AN OUTPUT TERMINAL; SWTICHING MEANS OPERABLE TO CONNECT SAID HEADS TO SAID OUTPUT TERMINAL IN A CYCLIC SEQUENCE; SIGNAL GENERATOR MEANS OPERATING TO DEVELOP A SUCCESSION OF SWITCH DRIVE SIGNALS REPETITIVE AT SAID HEAD SEQUENCE FREQUENCY; MEANS APPLYING SAID SWITCH DRIVE
Claim 2
Dependent Claim
117 words
MAGNETIC RECORD PLAYBACK APPARATUS COMPRISING IN COMBINATION: A MAGNETIC TAPE HAVING A SIGNAL RECORDED THEREON IN A SUCCESSION OF INDIVIDUAL RECORD TRACKS; A ROTATABLE MEMBER; A PLURALITY OF SIGNAL TRANSDUCER HEADS SPACED ABOUT THE PERIPHERY OF SAID MEMBER; DRIVE MEANS OPERABLE TO DRIVE SAID MEMBER AT A PREDETERMINED SPEED OF ROTATION; GUIDE MEANS PRESENTING SAID TAPE FOR ENGAGEMENT WITH SAID MEMBER WHEREBY SAID HEADS ENGAGE SAID RECORD TRACKS IN A CYCLIC SEQUENCE HAVING A PREDETERMINED FREQUENCY; AN OUTPUT TERMINAL; SWTICHING MEANS OPERABLE TO CONNECT SAID HEADS TO SAID OUTPUT TERMINAL IN A CYCLIC SEQUENCE; SIGNAL GENERATOR MEANS OPERATING TO DEVELOP A SUCCESSION OF SWITCH DRIVE SIGNALS REPETITIVE AT SAID HEAD SEQUENCE FREQUENCY; MEANS APPLYING SAID SWITCH DRIVE
References Cited (Backward Citations)
US2968692A
Cited
US2979557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |