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San Francisco, CA, United States of America

Crown Zellerbach Corporation

USPTO Granted Patents = 107

Trademarks = 7

Forward Citations = 2,396

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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

Pyrolysis

Collapsible Containers

Heatseal Die

Pneumatic Conveying

Web Slitting

Lime Slaker

High Bulk Papermaking

Embossing Apparatus

Plastic Film Wrapper

Forestry Site Preparation

Discrete Article Transport

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),

Crown Zellerbach Corporation is a leading multinational conglomerate with a diverse portfolio of businesses. With deep roots in the industry, the company has a rich history dating back over a century. Crown Zellerbach Corporation operates in multiple sectors including paper manufacturing, timber, packaging, and consumer products. Through innovation, sustainability, and a commitment to excellence, the company has continually expanded its reach and established itself as a global leader in its various industries.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

107 Patents

#57 in San Francisco, CA

#794 in California

#3,432 in US

#7,124 in the World

San Francisco, CA, United States of America

Crown Zellerbach Corporation

Forward Citations = 2,396

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)

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