Assignee

SETHOFER NICHOLAS L

US·1 granted patent·208 citations·filing 1989–1989

Technology mixA61F1 G02F1

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0186US5172256ALiquid crystal variable color density lens and eye protective devices incorporating the sameSETHOFER NICHOLAS L·Filed 1989·Granted Dec 15, 1992·208 cites·17 claims

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