The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 1995
Filed:
May. 06, 1994
Amy L Moe, Holmen, WI (US);
Jiri D Konicek, Onalaska, WI (US);
AlliedSignal Inc., Morris Township, Morris County, NJ (US);
Abstract
The degree of cure and the amount of epoxy resin in a glass fiber reinforced epoxy resin prepreg is measured by exposing the prepreg to a series of light pulses created by optical filters transmitting light at predetermined bandwidths about selected wavelengths, preferably centered at wavenumbers of about 4529 cm.sup.-1 and 4055 cm.sup.-1 and measuring the amount of epoxy groups and methyl groups present relative to reference values from the electrical pulses produced by a phase sensitive photoelectric detector disposed to receive said light pulses after being exposed to said prepreg. When such measurements are made in a continuously moving sheet of prepreg, it is possible to control the variation of percent cure and resin content to no greater than .+-.3% cure and .+-.3% resin content over a distance of at least 400 yds (366 m).