US4533965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic read/write circuit
Assignee: CINCINNATI TIME Inc A DE CORP
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Filing: 1984-04-18
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Granted: 1985-08-06
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Expires: 2004-04-18
Abstract
Abstract This invention is an automatic read to write or write to read switching electronic recording and playback circuit that automatically disconnects the write section of the circuit when it is not in use, thus permitting reading without the necessity of an additional signal to select read or write.
Inventors
- 👤 Gary Steinbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:33
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G09; G09B; G09B5/00; G09B5/04; G11B15/12; G11B19/00; G11B19/02; G11B20/00; G11B20/10; G11B20/18; G11B20/1816; G11B5/00; G11B5/02; G11B5/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
243 words
An automatic read to write or write to read switching electronic recording and playback circuit for recording and playing back digital information, said circuit comprises: (a) a high press filter for preventing the passage of low frequency signals; the input of said filter is coupled to said information; (b) a first amplifier that reproduces its input signal, the positive input of said amplifier is coupled to the output of said high pass filter; (c) a first diode whose anode is coupled to the output of said first amplifier; (d) a second diode whose cathode is coupled to the anode of said first diode and to the output of said first amplifier and whose anode is coupled to the cathode of said first diode so that said first amplifier and said first and second diodes will act like an automatic switch; (e) means for recording or reading information on a magnetic material, said means writes information when said means receives signals from said second diode and said means is completely disconnected from said second diode when it is not receiving signals; (f) a second amplifier whose input is coupled to said means for recording or reading information on a magnetic material, and whose output is coupled to the negative input of said second amplifier; and (g) a third amplifier whose positive input is coupled to the output of said second amplifier; said third amplifier shapes its input signals into a series of square waves.
Claim 2
Dependent Claim
243 words
An automatic read to write or write to read switching electronic recording and playback circuit for recording and playing back digital information, said circuit comprises: (a) a high press filter for preventing the passage of low frequency signals; the input of said filter is coupled to said information; (b) a first amplifier that reproduces its input signal, the positive input of said amplifier is coupled to the output of said high pass filter; (c) a first diode whose anode is coupled to the output of said first amplifier; (d) a second diode whose cathode is coupled to the anode of said first diode and to the output of said first amplifier and whose anode is coupled to the cathode of said first diode so that said first amplifier and said first and second diodes will act like an automatic switch; (e) means for recording or reading information on a magnetic material, said means writes information when said means receives signals from said second diode and said means is completely disconnected from said second diode when it is not receiving signals; (f) a second amplifier whose input is coupled to said means for recording or reading information on a magnetic material, and whose output is coupled to the negative input of said second amplifier; and (g) a third amplifier whose positive input is coupled to the output of said second amplifier; said third amplifier shapes its input signals into a series of square waves.
Claim 3
Dependent Claim
13 words
The circuit claimed in claim 1 wherein said means is a magnetic head.
Claim 4
Dependent Claim
30 words
The circuit claimed in claim 1 further including a detector coupled to the output of said second amplifier, said detector checks the information that is being recorded by said means.
Claim 5
Dependent Claim
13 words
The circuit claimed in claim 1 wherein said third amplifier is a comparator.
Claim 6
Dependent Claim
274 words
An automatic read to write or write to read switching electronic recording and playback circuit for recording and playing back information, said circuit comprises: (a) conversion means coupled to said information for making said information input signals into analog levels which are compatible with the rest of this circuit; (b) a high pass filter for preventing the passage of low frequency signals; the input of said filter is coupled to the output of said conversion means; (c) a first amplifier that reproduces its input signal, the positive input of said amplifier is coupled to the output of said high pass filter; (d) a first diode whose anode is coupled to the output of said first amplifier; (e) a second diode whose cathode is coupled to the anode of said first diode and to the output of said first amplifier, and whose anode is coupled to the cathode of said first diode so that said first amplifier and said first and second diodes will act like an automatic switch; (f) means for recording or reading information on a magnetic material, said recording means writes information when said recording means receives signals from said second diode and said recording means is completely disconnected from said second diode when it is not receiving signals; (g) a second amplifier whose input is coupled to said means for recording or reading information on a magnetic material, and whose output is coupled to the negative input of said second amplifier; and (h) a third amplifier whose positive input is coupled to the output of said second amplifier; said third amplifier shapes its input signals into a series of square waves.
Claim 7
Dependent Claim
274 words
An automatic read to write or write to read switching electronic recording and playback circuit for recording and playing back information, said circuit comprises: (a) conversion means coupled to said information for making said information input signals into analog levels which are compatible with the rest of this circuit; (b) a high pass filter for preventing the passage of low frequency signals; the input of said filter is coupled to the output of said conversion means; (c) a first amplifier that reproduces its input signal, the positive input of said amplifier is coupled to the output of said high pass filter; (d) a first diode whose anode is coupled to the output of said first amplifier; (e) a second diode whose cathode is coupled to the anode of said first diode and to the output of said first amplifier, and whose anode is coupled to the cathode of said first diode so that said first amplifier and said first and second diodes will act like an automatic switch; (f) means for recording or reading information on a magnetic material, said recording means writes information when said recording means receives signals from said second diode and said recording means is completely disconnected from said second diode when it is not receiving signals; (g) a second amplifier whose input is coupled to said means for recording or reading information on a magnetic material, and whose output is coupled to the negative input of said second amplifier; and (h) a third amplifier whose positive input is coupled to the output of said second amplifier; said third amplifier shapes its input signals into a series of square waves.
Claim 8
Dependent Claim
14 words
The circuit claimed in claim 5 wherein said recording means is a magnetic head.
Claim 9
Dependent Claim
30 words
The circuit claimed in claim 5 further including a detector coupled to the output of said second amplifier, said detector checks the information that is being recorded by said means.
Claim 10
Dependent Claim
14 words
The circuit claimed in claim 5 wherein said shaping means is a fourth amplifier.
Claim 11
Dependent Claim
13 words
The circuit claimed in claim 5 wherein said third amplifier is a comparator.
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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |