1
Gordhanbhai N Patel, Anthony F Preziosi, Ray H Baughman: Time-temperature history indicators. Allied Chemical Corporation, David W Collins, Ernest A Polin, December 28, 1976: US03999946 (146 worldwide citation)

Compositions containing at least two conjugated acetylene groups (-C.tbd.C-C.tbd.C-) are suitable as integral time-temperature history indicators. These compositions exhibit sequences of irreversible color changes at combinations of times and temperatures specific to each composition. Thus, when sup ...


2
Gordhanbhai N Patel: Solid state device for monitoring integral values of time and temperature of storage of perishables. JP Laboratories, October 19, 1993: US05254473 (83 worldwide citation)

An indicator composition and process capable of changing color in relationship to its exposure to a temperature above and below a base line temperature and to the time of said exposure, for monitoring the time-temperature history of a substrate, depositable as a layer on said substrate, comprising a ...


3
Gordhanbhai N Patel: Moving boundary device for monitoring shelf-life of a perishable product. JP Labs, September 3, 1991: US05045283 (81 worldwide citation)

A moving boundary device for monitoring the time-temperature storage history, i.e. shelf life, of perishable products. The device is constructed of an activator tape, containing an activator composition in an activator matrix, an indicating tape, containing an indicating composition in an indicator ...


4
Ray H Baughman, Gordhanbhai N Patel, Granville G Miller: Integrated time-temperature or radiation-dosage history recording device. Allied Corporation, Kenneth E Stroup Jr, Alan M Doernberg, Gerhard H Fuchs, June 21, 1983: US04389217 (65 worldwide citation)

A recording device is described, useful as an integrated time-temperature or radiation-dosage history indicator. The device contains a substrate having deposited thereon at least two indicating units, one being unreacted and representing zero time of exposure and the other unit being pre-reacted. Ea ...


5
Kwok C Yee, Anthony F Preziosi, Gordhanbhai N Patel, Ronald R Chance, Granville G Miller, Ray H Baughman: Thermochromic polyacetylenes containing urethane groups. Allied Chemical Corporation, Gerhard H Fuchs, Robert J North, Robert A Harman, July 29, 1980: US04215208 (58 worldwide citation)

Certain polyacetylenes exhibit reversible color changes at transition temperatures in the range -180.degree. to 220.degree. C., wherein the thermochromic cycles can be repeated many times with no apparent degradation and little change in spectroscopic properties.


6
Gordhanbhai N Patel: Co-crystallized acetylenic compounds. Allied Chemical Corporation, Robert J North, Gerhard H Fuchs, February 19, 1980: US04189399 (44 worldwide citation)

A composition is described comprising at least two co-crystallized acetylenic compounds, of different chemical structures, each containing at least one --C.tbd.C--C.tbd.C-- group and substituents selected from the group consisting of sulfonate, urethane and alcohol radicals, at least one of the comp ...


7
Gordhanbhai N Patel, Yao Ming Cheng, Subhash H Patel: Heat fixable high energy radiation imaging film. JP Laboratories, Frank S Chow, May 30, 1995: US05420000 (42 worldwide citation)

Described is a radiation sensitive imaging film containing a heat fixable radiation sensitive element, e.g., a diacetylene, of the formula: R--C.tbd.C--C.tbd.C--R', where R and R' are, e.g., both --CH.sub.2 --O--CONH--(CH.sub.2).sub.5 CH.sub.3. After exposure to X-radiation during diagnostic or X-ra ...


8
Gordhanbhai N Patel, Yao Ming Cheng, Subhash H Patel: Polyethyleneimine binder complex films. JP Laboratories, Jeffery J Brosemer, Frank S Chow, September 30, 1997: US05672465 (37 worldwide citation)

Described is a radiation sensitive imaging film containing a heat fixable radiation sensitive element, e.g., a diacetylene, of the formula: R--C.tbd.C--C.tbd.C--R', where R and R' are, e.g., both --CH.sub.2 --O--CONH--(CH.sub.2).sub.5 CH.sub.3. After exposure to X-radiation during diagnostic or X-ra ...


9
Gordhanbhai N Patel: Vapor permeation time-temperature indicator. Allied Chemical Corporation, Robert J North, Gerhard H Fuchs, March 25, 1980: US04195058 (37 worldwide citation)

An improved time-temperature indicator (t-T indicator) is described which is useful for monitoring the shelf lives of various perishable articles. The device is constructed of a vapor-permeable barrier positioned between a vapor and a liquid indicator, both housed in a vapor-impermeable container. T ...


10
Gordhanbhai N Patel: Vapor permeation time-temperature indicator. Allied Chemical Corporation, Robert J North, Gerhard H Fuchs, March 25, 1980: US04195056 (34 worldwide citation)

A time-temperature indicator (t-T indicator) is described which is useful for monitoring the shelf lives of various perishable articles. The device is constructed of a vapor-permeable barrier positioned between a vapor and an indicator, both housed in a vapor-impermeable container. The device is act ...