Growing community of inventors

Richmond, VA, United States of America

David B Spruill

Average Co-Inventor Count = 3.46

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 = 169

David B SpruillJoseph L Banyasz (2 patents)David B SpruillThomas V Van Auken (2 patents)David B SpruillWalter Allen Nichols (1 patent)David B SpruillReginald W Newsome (1 patent)David B SpruillWillie G Houck, Jr (1 patent)David B SpruillFrancis M Sprinkel (1 patent)David B SpruillDavid B Spruill (3 patents)Joseph L BanyaszJoseph L Banyasz (9 patents)Thomas V Van AukenThomas V Van Auken (8 patents)Walter Allen NicholsWalter Allen Nichols (69 patents)Reginald W NewsomeReginald W Newsome (33 patents)Willie G Houck, JrWillie G Houck, Jr (24 patents)Francis M SprinkelFrancis M Sprinkel (11 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Philip Morris Management Corp. (2 from 4 patents)

2. Philip Morris Inc. (1 from 759 patents)


3 patents:

1. 5037459 - Device for controlling relative humidity within a substantially sealed

2. 5035731 - Device for controlling relative humidity within a substantially sealed

3. 4687008 - Filter cigarette

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1/2/2026
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