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For the Inventor, By the Inventor

St. Louis County, MO, United States of America

Harold E Koeln

This inventor holds 4 USPTO granted patents. Top assignees: Penn Corporation, Ritepoint. Active years: 1979-1988.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Harold E Koeln. Retrieved from https://idiyas.com/inventor/harold-e-koeln

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

Calculating rank
USPTO Granted Patents = 4

% Patents Active = 100.0

Average Co-Inventor Count = 1.6

ph-index = 3

Forward Citations = 38(Granted Patents)


Location History:

  • Kirkwood, MO (US) (1979)
  • St. Louis County, MO (US) (1980 - 1988)

Company Filing History:

goldMedal3 out of 4 
 
Penn Corporation
 patents
silverMedal1 out of 1 
 
Ritepoint
 patent

Years Active: 1979-1988

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4 patents (USPTO):Explore Patents
1. 4786197 - Twist actuated writing instrument (1988-11-22),
2. 4257713 - Conical pen (1981-03-24),
3. 4217712 - Conical pen (1980-08-19),
4. 4161374 - Twist retractable writing implement (1979-07-17),

Title: Harold E. Koeln: Innovator in Writing Instruments

Introduction

Harold E. Koeln is a notable inventor based in St. Louis County, MO (US). He has made significant contributions to the field of writing instruments, holding a total of 4 patents. His innovative designs have enhanced the functionality and usability of everyday writing tools.

Latest Patents

One of Harold's latest inventions is the Twist Actuated Writing Instrument. This device features a barrel, a cap, a two-directional cam, and an actuator that encases a writing element and a spring. The unique design allows the cap to be rotated in either a clockwise or counterclockwise direction, enabling the writing element to be advanced or retracted as needed. Another notable invention is the Conical Pen, which is designed in a conical shape for improved stability and reduced chances of being misplaced. This writing instrument also offers ample surface area for decorative or promotional displays.

Career Highlights

Throughout his career, Harold has worked with several companies, including Penn Corporation and Ritepoint. His experience in these organizations has contributed to his expertise in developing innovative writing solutions.

Collaborations

Harold has collaborated with talented individuals such as Michael Lembeck and Alan E. Sherman, further enriching his inventive journey.

Conclusion

Harold E. Koeln's contributions to the field of writing instruments demonstrate his innovative spirit and dedication to enhancing everyday tools. His patents reflect a commitment to functionality and design that continues to influence the industry.

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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