Company Filing History:

10 out of 1,390

Iowa State University Research Foundation Inc

patents

Lawrence Livermore National Security, LLC

patents

4. 1 out of 832,843

Other

patents

where one patent can have more than one assignee

Years Active: 1993-2022

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11 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 11462358 - Method of tetratenite production and system therefor (2022-10-04),

2. 10586640 - Neodymium-iron-boron magnet with selective surface modification, and method of producing same (2020-03-10),

3. 6352649 - Material for magnetostrictive sensors and other applications based on ferrite materials (2002-03-05),

4. 6093337 - Material for magnetostrictive sensors and other applications based on (2000-07-25),

5. 5803992 - Carbide/nitride grain refined rare earth-iron-boron permanent magnet and (1998-09-08),

6. 5690889 - Production method for making rare earth compounds (1997-11-25),

7. 5486240 - Carbide/nitride grain refined rare earth-iron-boron permanent magnet and (1996-01-23),

8. 5470401 - Method of making bonded or sintered permanent magnets (1995-11-28),

9. 5433978 - Method of making quasicrystal alloy powder, protective coatings and (1995-07-18),

10. 5242508 - Method of making permanent magnets (1993-09-07),

11. 5240513 - Method of making bonded or sintered permanent magnets (1993-08-31),

Title: R William McCallum: Innovator in Magnetic Materials

Introduction

R William McCallum is a notable inventor based in Ames, Iowa, recognized for his contributions to the field of magnetic materials. With a total of 11 patents to his name, McCallum has made significant advancements in the production and enhancement of high-performance magnets.

Latest Patents

Among his latest patents is a method for tetratenite production and the system therefor. This invention provides a method for creating high coercivity magnetic materials based on FeNi alloys with an L1 phase structure, known as tetratenite. The process involves preparing a melt of Fe, Ni, and optional elements such as Ti, V, Al, B, C, Mo, Ir, and Nb, followed by cooling the melt while applying extensional stress and a magnetic field. This is succeeded by heating and cooling to form the L10 structure.

Another significant patent is for a neodymium-iron-boron magnet with selective surface modification, along with a method for producing it. This invention describes a bulk high-performance permanent magnet that features a neodymium-iron-boron core with a coercivity-enhancing element on its outer surface. The method includes depositing this element on the outer surface and subjecting the coated magnet to a pulse thermal process, which heats the outer surface to a temperature significantly higher than that of the interior portion, facilitating the diffusion of the coercivity-enhancing element.

Career Highlights

Throughout his career, McCallum has worked with reputable organizations, including the Iowa State University Research Foundation and UT-Battelle, Inc. His work has been instrumental in advancing the understanding and application of magnetic materials in various industries.

Collaborations

McCallum has collaborated with notable colleagues such as Kevin W. Dennis and Iver E. Anderson, contributing to the innovative research and development in his field.

Conclusion

R William McCallum's contributions to the field of magnetic materials through his patents and collaborations highlight his role as a significant inventor. His work continues to influence advancements in high-performance magnets and their applications.

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