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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Threlfall; Ian M.
Address:
Wigan, GB2
No. of patents:
1
Patents:












Patent Number Title Of Patent Date Issued
4851471 Process for manufacturing photochromic articles July 25, 1989
A direct casting process for manufacturing a shaped synthetic plastic article, such as an ophthalmic lens, which has photochromic properties, the process comprising incorporating a photochromic spiro-oxazine compound into a mixture comprising a highly reactive polyfunctional monomer and










 
 
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