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Raleigh, NC, United States of America

Carl W Sigel

Average Co-Inventor Count = 3.00

ph-index = 3

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 38

Carl W SigelCharles A Nichol (4 patents)Carl W SigelDavid Stanley Duch (4 patents)Carl W SigelCarl W Sigel (4 patents)Charles A NicholCharles A Nichol (10 patents)David Stanley DuchDavid Stanley Duch (7 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Burroughs Wellcome Co. (4 from 521 patents)


4 patents:

1. 4897395 - Treatment with dialkoxy pyridopyrimidines

2. 4661490 - Treatment with dialkoxy pyridopyrimidines

3. 4512992 - Treatment with dialkoxy pyridopyrimidine compounds

4. 4372957 - Treatment with dialkoxy pyridopyrimidines

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as of
12/8/2025
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