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San Francisco, CA, United States of America

Crown Zellerbach Corporation

USPTO Granted Patents = 107

Trademarks = 4

Forward Citations = 2,417

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74 inventors (with patents filed for the assignee):

Imants Reba (27 out of 27 patents)

Rudolph W Schutz (9 out of 24 patents)

Rudolf R Weis (9 out of 9 patents)

4. Ray H Stollberg (8 out of 8 patents)

5. Ellsworth A Hartbauer (5 out of 5 patents)

6. Edward C Wolthausen (4 out of 4 patents)

7. Ronald E Hostetler (4 out of 4 patents)

8. John H Kozlowski (3 out of 3 patents)

9. William G Whalley (3 out of 3 patents)

10. George I Rucker (3 out of 3 patents)

11. Merle E Cisney (3 out of 3 patents)

12. Paul C Litzinger (3 out of 3 patents)

13. Fred L Schmidt (3 out of 3 patents)

14. Gerald Hugh Hogland (3 out of 3 patents)

15. David W Goheen (3 out of 3 patents)

Core Competencies:

Spunbonded Webs

High Bulk Papermaking

Web Slitting

Pneumatic Conveying

Container Assembly

Filament Dispersing

Liquid Spray Curtain

Packaging Films

Embossing Apparatus

Lignocellulose Treatment

Flexible Packaging

Heatseal Die

107 patents: Sort by Forward Citations

1. 4644045 - Method of making spunbonded webs from linear low density polyethylene (1987-02-17),

2. 4643775 - Fabric conditioning and cleaning system (1987-02-17),

3. 4637858 - Pyrolysis of black liquor at high temperatures using radiant energy (1987-01-20),

4. D285019 - Hand truck for displaying a product (1986-08-05),

5. 4597573 - System for handling discrete sheets (1986-07-01),

6. 4585159 - Collapsible container and frame (1986-04-29),

7. 4582555 - Heatseal die (1986-04-15),

8. 4581083 - Roll product tail securing system (1986-04-08),

9. 4576675 - System for securing a plurality of objects together with adhesive tape (1986-03-18),

10. 4574996 - Multi-cell container (1986-03-11),

11. 4573633 - Corner lock on paperboard baking and shipping tray (1986-03-04),

12. 4551199 - Apparatus and process for treating web material (1985-11-05),

13. 4548770 - Subjecting film to corona discharge prior to compression rolling (1985-10-22),

14. 4548081 - Ultrasonic softness testing system (1985-10-22),

15. 4547349 - Method of slaking lime (1985-10-15),

Company Overview

Crown Zellerbach Corporation, headquartered in San Francisco, CA, specializes in advanced papermaking technologies. The company focuses on innovative processes such as spunbonded webs, high bulk papermaking, and web slitting, contributing to the efficiency and quality of paper products. Additionally, Crown Zellerbach is involved in pneumatic conveying, container assembly, filament dispersing, and liquid spray curtain technologies, enhancing packaging films and related applications. Its expertise positions it as a key player in the paper and packaging industry.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

107 Patents

#57 in San Francisco, CA

#810 in California

#3,569 in US

#7,342 in the World

San Francisco, CA, United States of America

Crown Zellerbach Corporation

Forward Citations = 2,417

74 inventors:

Imants Reba (27 out of 27 patents)

Rudolph W Schutz (9 out of 24 patents)

Rudolf R Weis (9 out of 9 patents)

4. Ray H Stollberg (8 out of 8 patents)

5. Ellsworth A Hartbauer (5 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Crown Zellerbach Corporation. Retrieved from https://idiyas.com/company/crown-zellerbach

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

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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