Photoactivatable leuco base time-temperature indicator

Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

116206, 116207, 252962, 374162, 426 88, 436905, G01K 304, G01K 1112

Patent

active

049175033

ABSTRACT:
A photoactivated time-temperature indicator is based on a leuco base system. A thermally insensitive, white ("inactive") leuco base (or a mixture of such leuco bases) is mixed, preferably in a polymeric matrix, with a material that generates acid upon exposure to light. Photoexcitation, preferably by UV or near UV light, causes the formation of a thermally sensitive, color-forming ("active") product. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those stored at subambient temperature.

REFERENCES:
patent: 2936276 (1960-05-01), Chalkley
patent: 3525616 (1970-08-01), Hackmann et al.
patent: 3768976 (1973-10-01), Hu et al.
patent: 3954475 (1976-05-01), Bonham et al.
patent: 3966414 (1976-06-01), Khattab et al.
patent: 4022617 (1977-05-01), McGuckin
patent: 4039332 (1977-08-01), Kokelenberg et al.
patent: 4189399 (1980-02-01), Patel
patent: 4205043 (1980-05-01), Esch et al.
patent: 4208186 (1980-06-01), Patel
patent: 4212153 (1980-07-01), Kyonieus et al.
patent: 4276190 (1981-06-01), Patel
patent: 4373032 (1983-02-01), Preziozi et al.
patent: 4466941 (1984-08-01), Cerami et al.
patent: 4594307 (1986-06-01), Ishida
Richard Seltzer, "Indicator for perishable products developed", C & EN, 9-29-86.
J. V. Crivello, Polymer Eng. & Sci. 23,953, (1983).
J. V. Crivello et al., J. Polymer Sci., Symposium Nw. 56,383, (1976).
S. Maslowski, Appl. Optics 13,857, (1974).
Shelf Life Estimation of Beverage and Food Products using Bar Coded Time-Temperature Indicator Labels.
H. R. Bhattacharjee--Photoactivatable Time-Temperature Indicators for Low-Temperature Applications, J. of Agricultural and Food Chemistry, vol. 36, pp. 525-529.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Photoactivatable leuco base time-temperature indicator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photoactivatable leuco base time-temperature indicator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoactivatable leuco base time-temperature indicator will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1048353

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.