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USPTO Data Jan 1 1976 - Sep 22 2026
1 Patents
#28 in Fort Mill, SC
#922 in South Carolina
#136,577 in US
Promethean Devices LLC
Forward Citations = 12
5 inventors:
Fort Mill, SC, United States of America
Promethean Devices LLC
% Expired Patents = 100.0
EPO Patents = 1
Forward Citations = 12
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5 inventors (with patents filed for the assignee):
Steven J Syracuse (1 out of 3 patents)
Peter G Halverson (1 out of 2 patents)
Frederick M Tesche (1 out of 1 patent)
4. Charles V Barlow (1 out of 1 patent)
5. Roy W Clark (1 out of 11 patents)
6. Roy Clark (0 patent)
1 patent:
Please report any incorrect information to [email protected]
Please report any incorrect information to [email protected]
1 patent (EPO):
Please report any incorrect information to [email protected]