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For the Inventor, By the Inventor

Fayetteville, NY, United States of America

David A Johnson

This inventor holds 11 USPTO granted patents. Top assignee: Bristol-Myers Company. Active years: 1976-1982.

IDiyas Innovation Intelligence. (2026). Inventor Profile: David A Johnson. Retrieved from https://idiyas.com/inventor/david-a-johnson-vg9wvybj

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

USPTO Granted Patents = 11

% Patents Active = 100.0

Average Co-Inventor Count = 3.2

ph-index = 3

Forward Citations = 32(Granted Patents)


Company Filing History:

goldMedal11 out of 637 
 
Bristol-Myers Company
 patents

Years Active: 1976-1982

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11 patents (USPTO):Explore Patents
1. 4351766 - Production of penicillins (1982-09-28),
2. 4316017 - Cephalosporin intermediates (1982-02-16),
3. 4316016 - Cephalosporin intermediates (1982-02-16),
4. 4310458 - Production of penicillins (1982-01-12),
5. 4278600 - Production of penicillins (1981-07-14),
6. 4240960 - Trimethylsilyl substituted penicillins (1980-12-23),
7. 4223135 - Production of cephalosporins (1980-09-16),
8. 4185015 - Methoxymethyl (1980-01-22),
9. 3996236 - Methoxymethyl (1976-12-07),
10. 3941773 - Form II ampicillin (1976-03-02),
11. 3932392 - Process for the preparation of 7-aminocephalosporanic acids (1976-01-13),

Title: The Innovations of David A. Johnson

Introduction

David A. Johnson is a notable inventor based in Fayetteville, NY (US). He has made significant contributions to the field of pharmaceuticals, particularly in the production of penicillins and cephalosporins. With a total of 11 patents to his name, Johnson's work has had a lasting impact on antibiotic development.

Latest Patents

One of Johnson's latest patents involves the production of penicillins. He developed a method for preparing trimethylsilyl or another easily hydrolyzed ester of 6-trimethylsilyloxycarbonylaminopenicillanic acid. This method was found to be a useful intermediate in the production of penicillins, such as amoxicillin and ampicillin, through acylation in anhydrous media with the appropriate acid chloride or acid chloride hydrochloride. Another significant patent focuses on cephalosporin intermediates. In this invention, trimethylsilyl 7-trimethylsilyloxycarbonylaminodecephalosporanate was prepared, which serves as an intermediate in the production of cefadroxil and cephalexin.

Career Highlights

David A. Johnson has spent a considerable part of his career at Bristol-Myers Company, where he has been instrumental in advancing pharmaceutical research and development. His innovative approaches have led to the creation of valuable intermediates that enhance the efficiency of antibiotic production.

Collaborations

Throughout his career, Johnson has collaborated with several esteemed colleagues, including Chester Sapino, Jr. and Herbert H. Silvestri. These partnerships have fostered a collaborative environment that has contributed to the success of his inventions.

Conclusion

David A. Johnson's contributions to the field of pharmaceuticals through his innovative patents have significantly advanced the production of essential antibiotics. His work continues to influence the industry and improve healthcare outcomes.

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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