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For the Inventor, By the Inventor

Elmhurst, IL, United States of America

Donald J Hoffmann

USPTO Granted Patents = 11

Average Co-Inventor Count = 1.5

ph-index = 9

Forward Citations = 241(Granted Patents)


Location History:

  • Elhmurst, IL (US) (1996)
  • Elmhurst, IL (US) (1993 - 2000)

Company Filing History:

goldMedal11 out of 95 
 
Wallace Computer Services, Inc.
 patents

Years Active: 1993-2000

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11 patents (USPTO):Explore Patents
1. 6060428 - Heat-sensitive chromogenic system (2000-05-09),
2. 5970875 - Pressure-sensitive tamper evident system (1999-10-26),
3. 5874142 - Linerless adhesive-equipped carrier assembly and method (1999-02-23),
4. 5612541 - Ultraviolet radiation monitoring device and use thereof (1997-03-18),
5. 5587222 - Label assembly with multi-ply insert (1996-12-24),
6. 5562789 - Label-equipped web method (1996-10-08),
7. 5484169 - Hidden entry system and image-developing device therefor (1996-01-16),
8. 5431452 - Hidden entry system and image-developing device therefor (1995-07-11),
9. 5421942 - Label-equipped web method (1995-06-06),
10. 5271787 - Method of making and using a label-equipped form (1993-12-21),
11. 5254381 - Label-equipped sheet (1993-10-19),

Title: The Innovative Contributions of Donald J. Hoffmann

Introduction

Donald J. Hoffmann is a notable inventor based in Elmhurst, IL (US), recognized for his significant contributions to the field of chromogenic systems. With a total of 11 patents to his name, Hoffmann has developed innovative technologies that enhance the functionality and security of printed documents.

Latest Patents

Among his latest patents is the "Heat-sensitive chromogenic system," which describes a document capable of providing information when heat is applied. This system includes a first support with a visible principal image and a localized coating that reacts to heat, producing a colored image. The chromogenic composition used in this invention consists of colorless solids that react chemically to create a visible image when heated above room temperature. Another significant patent is the "Pressure-sensitive tamper evident system," designed for use with impact printers. This document features a substrate that receives a principal colored image while being free from color-forming compositions. The second surface is coated with a pressure-sensitive chromogenic composition that forms a visible mirror image, allowing users to verify the registration of images.

Career Highlights

Hoffmann's career is marked by his role at Wallace Computer Services, Inc., where he has contributed to the development of innovative printing technologies. His work has not only advanced the capabilities of printed documents but has also enhanced their security features.

Collaborations

Throughout his career, Hoffmann has collaborated with notable colleagues, including John C. Chang and Ronald R. Garrison. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Donald J. Hoffmann's contributions to the field of chromogenic systems exemplify the impact of innovation in document technology. His patents reflect a commitment to enhancing both functionality and security in printed materials.

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