US3774450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature indicating composition
Assignee: Pymah Corp
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Filing: 1971-07-15
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Granted: 1973-11-27
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Expires: 1991-07-15
Abstract
Abstract An improved temperature indicator is provided which comprises a carrier having at least one but preferably a plurality of regions, each containing a substance consisting of a core material and a wall material encapsulating the core material. Each core material is a thermally responsive substance which undergoes change of state at precise and predetermined temperature and the wall material is a frangible coating which can be ruptured by the application of a relatively mild pressure. An indicator means overlies the temperature indicating portion of said indicator in association with said regions so that when the frangible coating is ruptured, the indicator means becomes intimately associated with said core material. The wall material is capable of withstanding hostile environmental conditions which protects the core material from premature exposure until the temperature indicator is ready to be used for its intended application.
Inventors
- 👤 F Godsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:13
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/025; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
88 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having at least one region containing a substance composed of a plurality of discrete particles, each particle consisting of a core material and a frangible wall material contiguously encapsulating said core material, said core material being a thermally responsive substance which undergoes change of state at predetermined temperature, and indicator means associated with said substance in said region, said indicator means being adapted to facilitate visual detection of the change of state of said core material.
Claim 2
Dependent Claim
88 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having at least one region containing a substance composed of a plurality of discrete particles, each particle consisting of a core material and a frangible wall material contiguously encapsulating said core material, said core material being a thermally responsive substance which undergoes change of state at predetermined temperature, and indicator means associated with said substance in said region, said indicator means being adapted to facilitate visual detection of the change of state of said core material.
Claim 3
Dependent Claim
16 words
Temperature indicator as in claim 1 wherein said indicator means comprises a dye or a pigment.
Claim 4
Dependent Claim
39 words
Temperature indicator as in claim 2 wherein said indicator means comprises a compound which forms a eutectic mixture with said core material and which compound has a higher melting point than the highest melting core material in said regions.
Claim 5
Dependent Claim
16 words
Temperature indicator as in claim 3 wherein said wall material is frangible coating of polymeric material.
Claim 6
Dependent Claim
16 words
Temperature indicator as in claim 2 wherein said wall material is frangible coating of polymeric material.
Claim 7
Dependent Claim
39 words
Temperature indicator as in claim 1 wherein said indicator means comprises a compound which forms a eutectic mixture with said core material and which compound has a higher melting point than the highest melting core material in said regions.
Claim 8
Dependent Claim
16 words
Temperature indicator as in claim 6 wherein said wall material is frangible coating of polymeric material.
Claim 9
Dependent Claim
16 words
Temperature indicator as in claim 1 wherein said wall material is frangible coating of polymeric material.
Claim 10
Dependent Claim
125 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having at least one region containing a first substance comprising a first core material and a first wall material encapsulating said first core material, and a second substance comprising a second core material and a second wall material, said second core material being a dye or pigment, said first core material being a thermally responsive substance which under-goes change of state at predetermined temperature and said first wall and said second wall materials being frangible coatings rupturable by mild pressure, and indicator means associated with said first substance and said second substance in said region, said indicator means being adapted to facilitate visual detection of the change of state of said core material.
Claim 11
Dependent Claim
125 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having at least one region containing a first substance comprising a first core material and a first wall material encapsulating said first core material, and a second substance comprising a second core material and a second wall material, said second core material being a dye or pigment, said first core material being a thermally responsive substance which under-goes change of state at predetermined temperature and said first wall and said second wall materials being frangible coatings rupturable by mild pressure, and indicator means associated with said first substance and said second substance in said region, said indicator means being adapted to facilitate visual detection of the change of state of said core material.
Claim 12
Dependent Claim
39 words
Temperature indicator as in claim 9 wherein said indicator means comprises a compound which forms a eutectic mixture with said core material and which compound has a higher melting point than the highest melting core material in said regions.
Claim 13
Dependent Claim
16 words
Temperature indicator as in claim 10 wherein said wall material is frangible coating of polymeric material.
Claim 14
Dependent Claim
16 words
Temperature indicator as in claim 9 wherein said wall material is frangible coating of polymeric material.
Claim 15
Dependent Claim
115 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a substance composed of plurality of discrete particles, each particle consisting of a core material and a frangible wall material contiguously encapsulating said core material, said core material being a thermally responsive substance which undergoes a change of state at a predetermined temperature different from the temperature of the change of state in any other core material in said regions, an indicator means associated with said substances in said regions, said indicator means means being adapted to facilitate visual detection of the change of state of each of said core materials in said regions.
Claim 16
Dependent Claim
115 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a substance composed of plurality of discrete particles, each particle consisting of a core material and a frangible wall material contiguously encapsulating said core material, said core material being a thermally responsive substance which undergoes a change of state at a predetermined temperature different from the temperature of the change of state in any other core material in said regions, an indicator means associated with said substances in said regions, said indicator means means being adapted to facilitate visual detection of the change of state of each of said core materials in said regions.
Claim 17
Dependent Claim
15 words
Temperature indicator as in claim 13 wherein said indicator means comprises a dye or pigment.
Claim 18
Dependent Claim
39 words
Temperature indicator as in claim 14 wherein said indicator means comprises a compound which forms a eutecTic mixture with said core material and which compound has a higher melting point than the highest melting core material in said regions.
Claim 19
Dependent Claim
16 words
Temperature indicator as in claim 14 wherein said wall material is frangible coating of polymeric material.
Claim 20
Dependent Claim
39 words
Temperature indicator as in claim 13 wherein said indicator means comprises a compound which forms a eutectic mixture with said core material and which compound has a higher melting point than the highest melting core material in said regions.
Claim 21
Dependent Claim
22 words
Temperature indicator as in claim 17 wherein said first wall material and said second wall material are frangible coating of polymeric material.
Claim 22
Dependent Claim
16 words
Temperature indicator as in claim 13 wherein said wall material is frangible coating of polymeric material.
Claim 23
Dependent Claim
146 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a first substance comprising a first core material and a first wall material encapsulating said core material, and a second substance comprising a second core material and a second wall material encapsulating said second core material, said second core material being a dye or a pigment, said first core materials being thermally responsive substances each undergoing change of state at a predetermined temperature different from the temperature of change of state of any other of said first core materials, said first wall and said second wall materials being frangible coatings rupturable by mild pressure, and indicator means associated with said first substances and said second substances, said indicator means being adapted to facilitate visual detection of the change of state of said first core materials.
Claim 24
Dependent Claim
146 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a first substance comprising a first core material and a first wall material encapsulating said core material, and a second substance comprising a second core material and a second wall material encapsulating said second core material, said second core material being a dye or a pigment, said first core materials being thermally responsive substances each undergoing change of state at a predetermined temperature different from the temperature of change of state of any other of said first core materials, said first wall and said second wall materials being frangible coatings rupturable by mild pressure, and indicator means associated with said first substances and said second substances, said indicator means being adapted to facilitate visual detection of the change of state of said first core materials.
Claim 25
Dependent Claim
39 words
Temperature indicator as in claim 20 wherein said indicator means comprises a compound which forms a eutectic mixture with said core material and which compound has a higher melting point than the highest melting core material in said regions.
Claim 26
Dependent Claim
22 words
Temperature indicator as in claim 20 wherein said first wall material and said second wall material are frangible coating of polymeric material.
Claim 27
Dependent Claim
22 words
Temperature indicator as in claim 20 wherein said first wall material and said second wall material are frangible coating of polymeric material.
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |