Neil John Griffith, 843854 Sequoia St, San Diego, CA 92109

4346417, Aug 24, 1982

Mar 24, 1980

6/133076

Neil J. Griffith - San Diego CA

Spin Physics, Inc. - San Diego CA

G11B 5251
G11B 528

360115

A gapped magnetic core is comprised of core material of one type. Gapping material, which is magnetically different from the core material, "completely" bridges the core gap. The gapping material has a lower magnetic saturation level than does the core material; and thus the gap cannot act as a transducer gap until it becomes magnetically saturated. When gapped cores as described above are stacked to form a multitrack head, the effects of inductive coupling between the cores is prevented; i. e. , when, for example, one core of the stack of cores is actuated by magnetically saturating its gap, all other cores of the stack are inherently immune to inductive coupling to the actuated core. This is because induced flux in all non-actuated cores is magnetically short-circuited through their respective magnetic gaps.

4998532, Mar 12, 1991

Feb 21, 1989

7/313332

Neil Griffith - San Diego CA

LTI Biomedical, Inc. - San Diego CA

A61N 100

128419F

A portable non-invasive apparatus for electro-therapeutic stimulation of tissue and bone healing readily worn or carried by a patient, capable of generating an energy-efficient signal coacting with a suitable transducer of the signal, thereby realizing portability and stimulating tissue and bone healing.

5646806, Jul 8, 1997

May 8, 1996

8/646842

Neil J. Griffith - San Diego CA
James U. Lemke - San Diego CA
James Crosby - Santa Fe CA

Minnesota Mining And Manufacturing Company - St. Paul MN

G11B 1560

36013022

A sloping tape guide is provided for an arcuately scanning tape drive so that tension per unit width of a magnetic tape is equalized in the head/tape contact zone on a front face of a head assembly of the arcuate scanner. The tape wraps over the circular edge of the magnetic head assembly. As a consequence, the tension per unit width is higher at the center of the tape that at the edges. The low tension at the edges of the tape results in poor head to tape contact in these regions and consequently unacceptable signal performance. This invention overcomes these difficulties by providing a means to equalize tension per unit width across the tape. The sloping tape guide has a front sloping flat surface which is bounded by top and bottom edges and first and second side edges, the first side edge being closer to the lat surface slopes rearwardly from its first edge to its second edge away from the periphery of the head assembly. The second edge is concave so that top and bottom edge portions of the sloping surface have a longer path length than a center portion of the sloping surface. By wrapping the tape around the second edge, the top and bottom edge portions of the magnetic tape traverse a longer tape path length than the middle portion of the magnetic tape thereby increasing tension per unit width at the edge portions of the tape as the tape makes transducing contact with the magnetic heads scanning across the width of the tape.

5000178, Mar 19, 1991

Mar 18, 1988

7/170361

Neil J. Griffith - San Diego CA

LTI Biomedical, Inc. - San Diego CA

A61N 100

128419F

An electrical to electromagnetic transducer for applying electromagnetic energy to damaged potions of the living body, which provides high efficiency generation of electromagnetic fields for electromagnetic therapy by directing electromagnetic radiation to the damaged body part. Electromagnetic radiation is initially generated by a dipole consisting of a bar of high permeability material wrapped with an electrically conductive coil. The dipole is placed between a conductive shield and the damaged body part. An electrical signal passes through the coil which causes a magnetic field to be generated through and around the high permeability material. The field radiation pattern of the dipole is directed toward the damaged body part by a conductive shield. Magnetic fields which are generated away from the damaged body part intersect the conductive shield and establish eddy currents. These eddy currents in turn generate magnetic fields opposite and nearly equal to the magnetic fields generated by the electromagnetic source.

5014699, May 14, 1991

Nov 30, 1989

7/443741

Solomon R. Pollack - Dresher PA
Carl T. Brighton - Malvern PA
David Pienkowski - Exton PA
Neil J. Griffith - San Diego CA

Trustees of the University of Pennsylvania - Philadelphia PA

A61N 100

128419F

A non-invasive, portable electromagnetic therapeutic method and apparatus for promoting the healing of damaged or diseased living tissue including fractured bone and in particular nonunion or delayed union bone fractures are described. The method and apparatus involve generating a signal having a series of substantially symmetric voltage cycles of bursted pulses having narrow pulse widths on the order of 0. 5 to 20 microseconds and converting the signal into an electromagnetic field which extends into an area for desired tissue healing. The portable noninvasive apparatus can be readily worn or carried by a patient and is capable of generating an energy-efficient symmetrical signal coacting with a coil for transducing the signal into electromagnetic pulses.

4251910, Feb 24, 1981

Mar 23, 1979

6/023432

Neil J. Griffith - San Diego CA

Spin Physics, Inc. - San Diego CA

G11B 542

29603

High track density multitrack magnetic heads are batch-fabricated from a stack of wafers which are photolithographically processed to provide lands and grooves on the wafers. Thin magnetic films are deposited in the grooves; and coils respectively inductively cooperative with the films are photolithographically formed about the films, the lands serving both to provide track-to-track spacing and to protect the magnetic films from magnetostriction-producing stress.

4599668, Jul 8, 1986

Jun 15, 1983

6/504757

Neil J. Griffith - San Diego CA

Eastman Kodak Company - Rochester NY

G11B 512
G11B 530

360113

The invention teaches that if a "shorted" electrically conductive turn--deposited on a magnetic substrate--is employed to sense recorded signal flux, then the underlying substrate will efficiently support flux induced about the shorted turn. . . and such induced flux will correspond proportionately to the recorded signal flux. In accordance with the invention, an MR element is so situated that it senses induced flux about the shorted turn at a location thereof that is remote from the medium whose signal flux is to be reproduced.

4343026, Aug 3, 1982

Jul 9, 1980

6/167162

Neil J. Griffith - San Diego CA
Fredrick J. Jeffers - Escondido CA
Ward M. Calaway - Sierra Madre CA

Spin Physics, Inc. - San Diego CA

G11B 512
G11B 530

360113

An electrically conductive element is employed in proximity to a thin film magnetic structure. The conductive element has current applied to it which is just sufficient to maintain, by field coupling between the thin film structure and the conductive element, the given magnetic orientation of the thin film structure, this occurring despite the application of a signal field tending to reorient the magnetization of the thin film structure. Such current is, therefore, the analog of the applied signal field and, since the magnetization of the thin film structure, by virtue of induced magnetic feedback, does not appreciably change direction, harmonics of any signal field applied to the thin film structure, and noise, are not manifested in the current analog.