Forward Citations = 21

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3 inventors (with patents filed for the assignee):

Roy Swartz (2 out of 2 patents)

William J Mahoney (1 out of 4 patents)

Robert D Heyl (1 out of 9 patents)

4 patents: Sort by Forward Citations

1. 5009551 - Material handling system and control valve therefor (1991-04-23),

2. 4940131 - Material handling system and control valve thereof (1990-07-10),

3. 4869594 - Apparatus and method for blending particulate materials (1989-09-26),

4. 4830043 - Improvement in rotary valves (1989-05-16),

Company Overview

Delaware Investments, Inc. is a leading global asset management firm that offers a wide range of investment solutions to individuals, institutions, and financial advisors. With a focus on active management, Delaware Investments strives to deliver consistent, long-term performance for its clients. Through a combination of research-driven analysis and a disciplined investment process, Delaware Investments aims to meet the unique needs and objectives of its diverse client base.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

4 Patents

#617 in Wilmington, DE

#860 in Delaware

#60,671 in US

Wilmington, DE, United States of America

Delaware Investments, Inc.

Forward Citations = 21

3 inventors:

Roy Swartz (2 out of 2 patents)

William J Mahoney (1 out of 4 patents)

Robert D Heyl (1 out of 9 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Delaware Investments, Inc.. Retrieved from https://idiyas.com/company/delaware-investments

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]