US Patent Class 360
DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL



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Current as of: June, 1999
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  DF  CLASS NOTES
1  DF  RECORDING ON OR REPRODUCING FROM AN ELEMENT OF DIVERSE UTILITY
2  DF  .~ Card
3  DF  .~ Motion picture film
4  DF  MANUAL INPUT RECORDING
5  DF  RECORDING FOR SELECTIVE RETENTION OF A SPECIAL OCCURRENCE
6  DF  RECORDING COMBINED WITH METERING OR SENSING
7  DF  RECORDING FOR MONETARY DELAY OF AN ANALOG SIGNAL
8  DF  RECORDING FOR CHANGING DURATION, FREQUENCY OR REDUNDANT CONTENT OF AN ANALOG SIGNAL
12  DF  RECORDING OR REPRODUCING FOR AUTOMATIC ANNOUNCING
13  DF  RECORD EDITING
15  DF  RECORD COPYING
16  DF  .~ Contact transfer
17  DF  .~.~ With magnetic bias
18  DF  RECORDING OR REPRODUCING PLURAL INFORMATION SIGNALS ON THE SAME TRACK
20  DF  .~ Frequency multiplex
21  DF  .~ Head gap azimuth multiplex
22  DF  SPLITTING ONE INFORMATION SIGNAL FOR RECORDING ON PLURAL DISTINCT TRACKS OR REPRODUCING SUCH SIGNAL
23  DF  .~ Time division
24  DF  SPLITTING, PROCESSING AND RECOMBINING ONE INFORMATION SIGNAL FOR RECORDING OR REPRODUCING ON THE SAME TRACK
25  DF  CHECKING RECORD CHARACTERISTICS OR MODIFYING RECORDING SIGNAL FOR CHARACTERISTIC COMPENSATION
26  DF  ELECTRONICALLY CORRECTING PHASING ERRORS BETWEEN RELATED INFORMATION SIGNALS
27  DF  RECORDING OR REPRODUCING AN INFORMATION SIGNAL AND A CONTROL SIGNAL FOR CONTROLLING ELECTRONICS OF REPRODUCER
28  DF  .~ Reference carrier to control demodulator
29  DF  MODULATING OR DEMODULATING
30  DF  .~ Frequency
31  DF  MONITORING OR TESTING THE PROGRESS OF RECORDING
32  DF  CONVERTING AN ANALOG SIGNAL TO DIGITAL FORM FOR RECORDING; REPRODUCING AND RECONVERTING
39  DF  GENERAL PROCESSING OF A DIGITAL SIGNAL
40  DF  .~ In specific code or form
41  DF  .~.~ Nonreturn to zero
42  DF  .~.~ Phase code
43  DF  .~.~ Multi-frequency
44  DF  .~.~ Intra-cell transition
45  DF  .~ Pulse crowding correction
46  DF  .~ Head amplifier circuit
47  DF  .~ Redundant or complimentary tracks
48  DF  .~ Data in specific format
49  DF  .~ Address coding
50  DF  .~ Inter-record gap processing
51  DF  .~ Data clocking
52  DF  .~.~ With incremental movement between record and head
53  DF  .~ Data verification
54  DF  .~ Data recirculation
55  DF  GENERAL RECORDING OR REPRODUCING
57  DF  .~ Selective erase recording
58  DF  .~ Boundary displacement recording or transducers
59  DF  .~ Thermomagnetic recording or transducers
60  DF  .~ Recording-or erasing-prevention
61  DF  .~ Signal switching
62  DF  .~.~ Record-reproduce
63  DF  .~.~ Between plural stationary heads
64  DF  .~.~ Between heads in alternate engagement with medium
65  DF  .~ Specifics of equalizing
66  DF  .~ Specifics of biasing or erasing
67  DF  .~ Specifics of the amplifier
68  DF  .~.~ Recording amplifier
69  DF  AUTOMATIC CONTROL OF A RECORDER MECHANISM
70  DF  .~ Synchronizing moving-head moving-record recorders
71  DF  .~ Controlling the record
72.1  DF  .~.~ Locating specific areas
72.2  DF  .~.~.~ Responsive to recorded address
72.3  DF  .~.~.~ Responsive to tape transport
73.01  DF  .~.~ Speed
73.02  DF  .~.~.~ Control of relative speed between carriers
73.03  DF  .~.~.~ Rotary carrier
73.04  DF  .~.~.~ Linear carrier
73.05  DF  .~.~.~.~ Plural speed transport
73.06  DF  .~.~.~.~.~ Automatic change between fixed speeds
73.07  DF  .~.~.~.~.~ Automatic selection of carrier or track speed
73.08  DF  .~.~.~.~.~ Variable speed
73.09  DF  .~.~.~.~ Constant speed
73.11  DF  .~.~.~.~.~ By reproduced control signal and transport derived signal
73.12  DF  .~.~.~.~.~ By reproduced control signal
73.13  DF  .~.~.~.~.~.~ From separate track
73.14  DF  .~.~.~.~.~ By signal derived from transport
74.1  DF  .~.~ Stopping or reversing
74.2  DF  .~.~.~ Responsive to reel rotation
74.3  DF  .~.~.~ Responsive to tape tension
74.4  DF  .~.~.~ Responsive to magnetic recorded signals
74.5  DF  .~.~.~ Responsive to physical property of record
74.6  DF  .~.~.~.~ Photoelectric
74.7  DF  .~.~.~.~ Conductive
75  DF  .~ Controlling the head
76  DF  .~.~ Azimuth or skew
77.01  DF  .~.~ Track centering
77.02  DF  .~.~.~ Rotary carrier
77.03  DF  .~.~.~.~ By nonmagnetic sensing (e.g., optical, capacitive)
77.04  DF  .~.~.~.~ By memory storage of repeatable error or correction
77.05  DF  .~.~.~.~ By servo signal component from carrier surface separate from information signal bearing surface
77.06  DF  .~.~.~.~ Reproduced data signal used for tracking
77.07  DF  .~.~.~.~ By tracking signal recorded on or immediately beneath surface
77.08  DF  .~.~.~.~.~ Distinct servo sector
77.11  DF  .~.~.~.~.~ Continuous servo signal
77.12  DF  .~.~.~ Elongated web carrier (i.e., tape)
77.13  DF  .~.~.~.~ Transverse scan path
77.14  DF  .~.~.~.~.~ By pilot signal
77.15  DF  .~.~.~.~.~.~ Plural pilot signals along single transverse path
77.16  DF  .~.~.~.~.~ Having head deflection drive (e.g., piezoelectric bimorph)
77.17  DF  .~.~.~.~.~.~ Dithering
78.01  DF  .~.~ Track changing
78.02  DF  .~.~.~ Tape
78.03  DF  .~.~.~.~ Plural tapes
78.04  DF  .~.~.~ For rotary carrier (e.g., disc)
78.05  DF  .~.~.~.~ Coarse and fine head drive motors
78.06  DF  .~.~.~.~ Specified velocity pattern during access
78.07  DF  .~.~.~.~.~ Controlled by memory device
78.08  DF  .~.~.~.~ Specified spatial pattern during access
78.09  DF  .~.~.~.~ Including model of servo system or element
78.11  DF  .~.~.~.~ Including nonmagnetic position sensing
78.12  DF  .~.~.~.~ Including particular head actuator
78.13  DF  .~.~.~.~.~ Stepping motor
78.14  DF  .~.~.~.~ By recorded servo reference or address signal
78.15  DF  .~.~.~.~ Drum
79  DF  RECORDER CONTROL OF AN EXTERNAL DEVICE
80  DF  .~ Slide or movie projectors
81  DF  RECORD TRANSPORT WITH HEAD MOVING DURING TRANSDUCING
82  DF  .~ Belt record
83  DF  .~ Tape record
84  DF  .~.~ Rotating head
85  DF  .~.~.~ Tape in container
86  DF  .~ Disk record
87  DF  .~ Drum record
88  DF  RECORD TRANSPORT WITH HEAD STATIONARY DURING TRANSDUCING
89  DF  .~ Wire record
90  DF  .~ Tape record
91  DF  .~.~ Plural tapes
92  DF  .~.~.~ Tape in container
93  DF  .~.~ Tape in container
94  DF  .~.~.~ Transport accommodates different types
95  DF  .~.~.~ With tape extraction
96.1  DF  .~.~.~ Plural reels
96.2  DF  .~.~.~.~ With dual capstan drive
96.3  DF  .~.~.~.~ Reel drive details
96.4  DF  .~.~.~.~.~ With common capstan drive
96.5  DF  .~.~.~.~ Container mounting details
96.6  DF  .~.~.~.~.~ With pivotal holder
97.01  DF  .~ Disk record
97.02  DF  .~.~ Environmental control (e.g., air filter, temperature control)
97.03  DF  .~.~.~ Plural disks
97.04  DF  .~.~.~ Flexible disk
98.01  DF  .~.~ Plural disks
98.02  DF  .~.~.~ Axially fixed flexible disks
98.03  DF  .~.~.~.~ With pneumatic partioning of disks
98.04  DF  .~.~.~ Changer
98.05  DF  .~.~.~.~ Control detail
98.06  DF  .~.~.~.~ Mechanical detail
98.07  DF  .~.~.~ Rotational drive detail
98.08  DF  .~.~.~ Seating of disks
99.01  DF  .~.~ Flexible disk
99.02  DF  .~.~.~ Loading or ejecting mechanism
99.03  DF  .~.~.~.~ Motorized
99.04  DF  .~.~.~ Rotational drive detail
99.05  DF  .~.~.~ Disk seating
99.06  DF  .~.~ Loading or ejecting mechanism
99.07  DF  .~.~.~ Motorized
99.08  DF  .~.~ Rotational drive detail
99.09  DF  .~.~.~ Movable drive
99.11  DF  .~.~.~ Stationary drive
99.12  DF  .~.~ Disk seating
100.1  DF  .~ Drum record
101  DF  HEAD TRANSPORT WITH RECORD STATIONARY DURING TRANSDUCING
102  DF  FLUID BEARING HEAD
103  DF  .~ Flying head
104  DF  HEAD MOUNTING
105  DF  .~ For moving head into and out of transducing position
106  DF  .~ For shifting head between tracks
107  DF  .~ For moving head during transducing
108  DF  .~.~ Signal transfer to and from head
109  DF  .~ For adjusting head position
110  DF  HEAD
111  DF  .~ Flux gate
112  DF  .~ Hall effect
113  DF  .~ Magnetoresistive or magnetostrictive
114  DF  .~ Magneto-optic
115  DF  .~ Flux scanning
116  DF  .~ Cathode ray
117  DF  .~ Hand-held
118  DF  .~ Erase
119  DF  .~ Gap structure details
120  DF  .~.~ Spacer material
121  DF  .~.~ Plural gaps
122  DF  .~ Head surface structure
123  DF  .~ Head winding
124  DF  .~.~ For cross-talk prevention
125  DF  .~ Head core
126  DF  .~.~ Laminated
127  DF  .~.~ Nonmetallic
128  DF  .~ Head accessory
129  DF  .~.~ Housing
130.1  DF  .~.~ Record separator
130.2  DF  .~.~ Record guide
130.21  DF  .~.~.~ Tape record
130.22  DF  .~.~.~.~ Rotating head
130.23  DF  .~.~.~.~.~ Helical scan
130.24  DF  .~.~.~.~.~.~ Head drum details
130.3  DF  .~.~ Pressure element
130.31  DF  .~.~.~ Tape record
130.32  DF  .~.~.~.~ Element mounting details
130.33  DF  .~.~.~.~ Element in tape container
130.34  DF  .~.~.~ Disc record
131  DF  RECORD MEDIUM
132  DF  .~ In container
133  DF  .~.~ For disk
134  DF  .~ Tape
135  DF  .~ Disk
136  DF  .~ Drum
137  DF  MISCELLANEOUS
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CROSS-REFERENCE ART COLLECTIONS
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900  DF  DISK DRIVE PACKAGING
901  DF  .~ Access time
902  DF  .~ Storage density (e.g., bpi, tpi)
903  DF  .~ Physical parameter (e.g., form factor)
904  DF  .~.~ Weight
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FOREIGN ART COLLECTIONS
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FOR 100  DF  .~ Television signal (360/9.1)
FOR 101  DF  .~.~ Fast, slow, or stop reproducing (10.1)
FOR 102  DF  .~.~.~ Scan locus or tracking control (360/10.2)
FOR 103  DF  .~.~.~ Tape (360/10.3)
FOR 104  DF  .~.~ Field or frame skipping (360/11.1)
FOR 105  DF  .~ Television (360/14.1)
FOR 106  DF  .~.~ Control track (360/14.2)
FOR 107  DF  .~.~.~ Numerical code (360/14.3)
FOR 108  DF  .~ Audio and video (360/19.1)
FOR 109  DF  GENERAL PROCESSING OF A TELEVISION SIGNAL (360/33.1)
FOR 110  DF  .~ Inverting polarity of alternate periods (360/34.1)
FOR 111  DF  .~ Single field or frame recording (360/35.1)
FOR 112  DF  .~ Time correction (360/36.1)
FOR 113  DF  .~.~ Digital techniques (360/36.2)
FOR 114  DF  .~ Synchronization signal modifying (360/37.1)
FOR 115  DF  .~ Drop-out correction (360/38.1)