Freeze indicators suitable for mass production

Details Freeze indicators suitable for mass production Freeze indicators suitable for mass production

2008-03-18

2008-03-18

Smith, R. Alexander (Department: 2859)

Signals and indicators

Indicators

Temperature responsive or compensating means

C374S106000, C252S962000

Reexamination Certificate

active

11557000

ABSTRACT:
A freeze indicator employs, as active indicator element, dispersion of solid particles in a liquid medium which can be water or aqueous and which coagulates to provide an irreversible appearance change when subject to freezing. The liquid dispersion can be contained in an indicator volume around which extends a vapor block layer. The vapor block layer can prevent loss of liquid vapor from the dispersion and consequent drying out and dysfunctionality of the freeze indicator. For containing an aqueous medium, bilayer and trilayer laminate materials can be used which have a low water vapor transmission rate. The active indicator element can be a dilute colloidal dispersion of a metal such as gold or silver or other inorganic pigment material in water or an aqueous medium. Some embodiments avoid use of dispersants and the like and employ an active indicator element consisting of inorganic pigment particles, water and optionally an ice nucleating agent. Heavy water, or deuterated water can be components of the water, if desired.

REFERENCES:
patent: 2892798 (1959-06-01), Dobbs et al.
patent: 2971852 (1961-02-01), Schulein
patent: 3145145 (1964-08-01), Reznek et al.
patent: 3194669 (1965-07-01), Koch
patent: 3243303 (1966-03-01), Johnson
patent: 4028944 (1977-06-01), Erb
patent: 4148748 (1979-04-01), Hanlon et al.
patent: 4191125 (1980-03-01), Johnson
patent: 4195056 (1980-03-01), Patel
patent: 4457252 (1984-07-01), Manske
patent: 4457253 (1984-07-01), Manske
patent: 4569920 (1986-02-01), Smith-Johannsen
patent: 4846095 (1989-07-01), Emslander
patent: 4892677 (1990-01-01), Preziosi et al.
patent: 4998827 (1991-03-01), Holzer
patent: 5111768 (1992-05-01), Larsson et al.
patent: 5215378 (1993-06-01), Manske
patent: 5239942 (1993-08-01), Ignacio et al.
patent: 5964181 (1999-10-01), Pereyra et al.
patent: 6270122 (2001-08-01), Shadle et al.
patent: 6472214 (2002-10-01), Patel
patent: 6737274 (2004-05-01), Wright
patent: 6773637 (2004-08-01), DiSalvo et al.
patent: 6837620 (2005-01-01), Shahinpoor
patent: 6957623 (2005-10-01), Guisinger et al.
patent: 2004/0253733 (2004-12-01), Prusik et al.
“Standard and Customized Thermal Sensors Delivered . . . etc. Products—New Freeze . . . ”, www.americanthermal.com, 2005 American Thermal Instruments, Inc., (downloaded Oct. 2, 2006).
“MesoSilver® —True colloidal silver”, (2005) Purest Colloids, Inc. www.purestcolloids.com, (downloaded Oct. 27, 2006).
“Hot Tub Silver”, (2002) Purest Colloids, Inc., www.purestcolloids.com, (downloaded Oct. 27, 2006).
“MesoGold® —True colloidal gold”, (2002) Purest Colloids, Inc. www.purestcolloids.com, (downloaded Oct. 16, 2006).
Vali, “Ice Nucleation C Theory. A Tutorial”, for presentation at the NCAR/ASP 1999 Summer Colloquium, <vali@uwyo.edu>, http://www-das.uwyo.edu/vali, (downloaded Oct. 16, 2006).

Affiliated with

Also associated with

Rating

Freeze indicators suitable for mass production does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Freeze indicators suitable for mass production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Freeze indicators suitable for mass production will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3935263