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For the Inventor, By the Inventor

Siegburg, Germany

Franz Weissenfels

This inventor holds 12 USPTO granted patents. Top assignees: Dynamit Nobel Aktiengesellschaft, Isobloc Gmbh. Active years: 1976-1989.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Franz Weissenfels. Retrieved from https://idiyas.com/inventor/franz-weissenfels

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 12

% Patents Active = 100.0

Average Co-Inventor Count = 2.8

ph-index = 7

Forward Citations = 133(Granted Patents)


Location History:

  • Siegburg am Grafenkreuz, DE (1978)
  • Sieburg, DE (1978 - 1984)
  • Siegburg, DE (1976 - 1989)

Company Filing History:

goldMedal12 out of 658 
 
Dynamit Nobel Aktiengesellschaft
 patents
silverMedal1 out of 1 
 
Isobloc Gmbh
 patent
where one patent can have more than one assignee

Years Active: 1976-1989

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12 patents (USPTO):Explore Patents
1. 4889875 - Phenolic resin foams of high filler content and their use as insulation (1989-12-26),
2. 4426462 - Method for the preparation of highly absorbent phenolic resin foams (1984-01-17),
3. 4195458 - Hardenable compositions of improved thermal stability (1980-04-01),
4. 4166162 - Phenolic resin foam having reduced tendency to shrink (1979-08-28),
5. 4143867 - Metallurgical vessel (1979-03-13),
6. 4111911 - Method of hardening liquid resols (1978-09-05),
7. 4102832 - Method of hardening and foaming liquid resols using a mixture of diluent (1978-07-25),
8. 4070327 - Process for improving the mechanical properties of novolak-cured molded (1978-01-24),
9. 4042314 - Apparatus for the continuous manufacture of phenolic resin foam in (1977-08-16),
10. 4036798 - Hardenable compositions of improved thermal stability (1977-07-19),
11. 3999230 - Apparatus for the continuous manufacture of phenolic resin foam in (1976-12-28),
12. 3999230 - Apparatus for the continuous manufacture of phenolic resin foam in (1976-12-27),

Title: The Innovative Mind of Franz Weissenfels

Introduction

Franz Weissenfels, a distinguished inventor based in Siegburg, Germany, has made significant contributions to the field of materials science through his innovative inventions. With a total of 12 patents to his name, Weissenfels has focused primarily on developing advanced phenolic resin foams that exhibit superior properties for various applications, particularly in the construction industry.

Latest Patents

Among his notable patents, the invention of "Phenolic resin foams of high filler content and their use as insulation" stands out. This invention details a method for creating hard foams using phenolic resins as binding agents, in which more than 90% of the filler consists of aluminum hydroxide. The foam's composition is remarkably fluid, allowing for the production of moldings in diverse geometries, with the foam exhibiting excellent insulating properties, high compressive strength, minimal shrinkage, and exceptional fire resistance. Another significant patent is the "Method for the preparation of highly absorbent phenolic resin foams," which enhances the production of open-pored phenolic resin foams. This inventive improvement involves using low-boiling organic liquids and specific additives to achieve foams with enhanced absorptive qualities.

Career Highlights

Franz Weissenfels has successfully held positions in reputable companies such as Dynamit Nobel Aktiengesellschaft and Isobloc GmbH. His work in these organizations has played a critical role in advancing the development of innovative materials that meet the evolving needs of the construction sector.

Collaborations

Throughout his career, Weissenfels has collaborated with notable coworkers, including Hans Junger and Klaus Bruning, which has fostered a creative environment leading to the development of various cutting-edge technologies and materials.

Conclusion

Franz Weissenfels is a prominent inventor whose work has had a profound impact on the field of materials science, specifically through his advancements in phenolic resin foams. Through his innovative patents and collaborations, he continues to contribute significantly to the construction industry, enhancing building materials with improved performance characteristics.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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