US5340537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature indicating compositions
Assignee: La-Co Industries Inc
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Filing: 1993-04-16
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Granted: 1994-08-23
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Expires: 2013-04-16
Abstract
Abstract Temperature indicating compositions of dispersions in an aqueous binder of a color changing electron donating compound having a melting point greater than about 300° F. and a polymeric electron accepting resin reactive with the electron donating compound to produce a visible and permanent color change and having a T g and non-volatility effective to provide a color change to coatings containing the composition upon exposure to a predetermined heat history. Temperature indicating materials are also disclosed containing a support coated on at least one surface thereof with the temperature indicating composition to the present invention.
Inventors
- 👤 Richard B. Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:08
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/26; A61L2/28; C; C09; C09D; C09D11/00; C09D11/50; C09D5/00; C09D5/26; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
99 words
A temperature indicating composition comprising a dispersion in an aqueous binder of a color changing electron donating compound having a melting point greater than about 300° F. and a polymeric electron phenolic accepting resin reactive with said electron donating compound to produce a visible and permanent color change and having a T g greater than 270° F. and non-volatility such that coatings containing the composition are stable upon exposure to dry heat at 284° F. for 30 minutes yet produce a fully developed visible and permanent color change when subjected to saturated steam at 250° F. for twenty minutes.
Claim 2
Dependent Claim
99 words
A temperature indicating composition comprising a dispersion in an aqueous binder of a color changing electron donating compound having a melting point greater than about 300° F. and a polymeric electron phenolic accepting resin reactive with said electron donating compound to produce a visible and permanent color change and having a T g greater than 270° F. and non-volatility such that coatings containing the composition are stable upon exposure to dry heat at 284° F. for 30 minutes yet produce a fully developed visible and permanent color change when subjected to saturated steam at 250° F. for twenty minutes.
Claim 3
Dependent Claim
19 words
The temperature indicating composition of claim 1, wherein said phenolic resin comprises a high melt point meta-cresol novolac resin.
Claim 4
Dependent Claim
17 words
The temperature indicating composition of claim 1, wherein said phenolic resin comprises a polymer of Bisphenol A.
Claim 5
Dependent Claim
22 words
The temperature indicating composition of claim 1, wherein said polymeric electron accepting resin has a T g greater than about 290° F.
Claim 6
Dependent Claim
21 words
The temperature indicating composition of claim 4, wherein said polymeric electron accepting resin has a T g of about 300° F.
Claim 7
Dependent Claim
35 words
The temperature indicating composition of claim 5, wherein said electron donating compound comprises a prodye or chromogen selected from the group consisting of iso benzo furanones, iso benzo xanthanones, diamino fluoranes and substituted amino fluoranes.
Claim 8
Dependent Claim
18 words
The temperature indicating composition of claim 1, wherein said aqueous binder comprises an aqueous polymer solution or suspension.
Claim 9
Dependent Claim
13 words
The temperature indicating solution of claim 7, wherein said polymer comprises polyvinyl alcohol.
Claim 10
Dependent Claim
14 words
The temperature indicating composition of claim 1, wherein said electron donating compound is non-encapsulated.
Claim 11
Dependent Claim
15 words
The temperature indicating composition of claim 1, wherein said polymeric electron accepting resin in non-encapsulated.
Claim 12
Dependent Claim
22 words
A temperature indicating material comprising a support coated on at least one surface thereof with the temperature indicating composition of claim 1.
Claim 13
Dependent Claim
30 words
The temperature indicating material of claim 11, wherein said coated support surface comprises a material selected from the group consisting of polymeric materials, cellulosic materials, metal foils and laminates thereof.
Claim 14
Dependent Claim
25 words
The temperature indicating material of claim 11, wherein said temperature indicating composition is coated on said surface of said support by extrusion coating or printing.
Claim 15
Dependent Claim
35 words
The temperature indicating material of claim 13, wherein said printing comprises a printing process selected from the group consisting of metered doctor roll coating, gravure coating, flexography, lithography, reverse-roll coating, slot-die coating, silkscreening and decalcomania.
Claim 16
Dependent Claim
30 words
The temperature indicating material of claim 11 wherein said temperature indicating composition is coated on said support in a pattern that appears upon exposure to saturated steam at 250° F.
Claim 17
Independent Claim
181 words
A method for recording exposure to saturated steam at 250° F. and 15 psi for a minimum of twenty minutes comprising the steps of: providing a temperature indicating material comprising a support coated on at least one surface with a composition comprising a dispersion in an aqueous binder of a color changing electron donating compound having a melting point greater than 300° F. and a polymeric electron accepting phenolic resin reactive with said electron donating compound to produce a visible and permanent color change and having a T g greater than 270° F. and non-volatility such that coatings containing said composition are stable upon exposure to dry heat at 284° F. for thirty minutes yet produce a fully developed visible and permanent color change when subjected to saturated steam at 250° F. for twenty minutes; exposing said material to an elevated temperature condition; and evaluating the color of said composition coated on said support to determine whether said composition was exposed to saturated steam at 15 psi or greater and temperatures of 250° F. and higher for twenty or more minutes.
Claim 18
Independent Claim
181 words
A method for recording exposure to saturated steam at 250° F. and 15 psi for a minimum of twenty minutes comprising the steps of: providing a temperature indicating material comprising a support coated on at least one surface with a composition comprising a dispersion in an aqueous binder of a color changing electron donating compound having a melting point greater than 300° F. and a polymeric electron accepting phenolic resin reactive with said electron donating compound to produce a visible and permanent color change and having a T g greater than 270° F. and non-volatility such that coatings containing said composition are stable upon exposure to dry heat at 284° F. for thirty minutes yet produce a fully developed visible and permanent color change when subjected to saturated steam at 250° F. for twenty minutes; exposing said material to an elevated temperature condition; and evaluating the color of said composition coated on said support to determine whether said composition was exposed to saturated steam at 15 psi or greater and temperatures of 250° F. and higher for twenty or more minutes.
Claim 19
Independent Claim
183 words
A method for recording exposure to saturated solvent vapors at 275° F. and 20 psi for a minimum of twenty minutes, comprising the steps of: providing a temperature indicating material comprising a support coated on at least one surface with a composition comprising a dispersion in an aqueous binder of a color-changing electron donating compound having a melting point greater than 300° F. and a polymeric electron accepting phenolic resin reactive with said electron donating compound to produce a visible and permanent color change and having a T g greater than 270° F. and non-volatility such that coatings containing said composition are stable upon exposure to dry heat at 284° F. for thirty minutes yet produce a fully developed visible and permanent color change when subjected to saturated solvent vapors at 275° F. for twenty minutes; exposing said material to an elevated temperature condition; and evaluating the color of said composition coated on said support to determine whether said composition was exposed to saturated solvent vapors at 20 psi or greater and temperatures of 275° F. or higher for twenty or more minutes.
Claim 20
Independent Claim
183 words
A method for recording exposure to saturated solvent vapors at 275° F. and 20 psi for a minimum of twenty minutes, comprising the steps of: providing a temperature indicating material comprising a support coated on at least one surface with a composition comprising a dispersion in an aqueous binder of a color-changing electron donating compound having a melting point greater than 300° F. and a polymeric electron accepting phenolic resin reactive with said electron donating compound to produce a visible and permanent color change and having a T g greater than 270° F. and non-volatility such that coatings containing said composition are stable upon exposure to dry heat at 284° F. for thirty minutes yet produce a fully developed visible and permanent color change when subjected to saturated solvent vapors at 275° F. for twenty minutes; exposing said material to an elevated temperature condition; and evaluating the color of said composition coated on said support to determine whether said composition was exposed to saturated solvent vapors at 20 psi or greater and temperatures of 275° F. or higher for twenty or more minutes.
Claim 21
Dependent Claim
36 words
The method of claim 17, wherein said solvent vapors consist essentially of less than 15 percent water, approximately 0.25 percent formaldehyde and one or more alcohols selected from the group consisting of ethanol, isopropanol and methanol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-22 | 1998-02-21 | 1998-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-22 | 2002-02-21 | 2002-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-22 | 2006-02-21 | 2006-08-23 | $7700.00 | Window Closed / Lapsed |