US3874240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat detection and compositions and devices therefor
Assignee: National Aeronautics and Space Administration
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Filing: 1972-07-20
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Granted: 1975-04-01
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Expires: 1992-07-20
Abstract
Abstract Temperature change of a substrate such as a microelectronic component is sensed and detected by means of a mixture of a weak molecular complex of an electron donor compound such as an organic amine and an electron acceptor compound such as nitroaromatic compound. The mixture is encapsulated in a clear binder such as a vinyl resin.
Inventors
- 👤 Alan Rembaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:12
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A METHOD OF DETECTING TEMPERATURE CHANGE COMPRISING THE STEPS OF: APPLYING TO A HEAT GENERATING ELEMENT A LAYER OF A THERMOCHROMIC MIXTURE OF AN ELECTRON DONOR COMPOUND AND ELECRON ACCEPTOR COMPOUND THAT FORMS A WEAKLY ASSOCIATED COLOR COMPLEX IN THE LIQUID STATE; SEALING SAID LAYER TO SAID ELEMENT BY APPLYING TO SAID LAYER A SOLUTION OF A TRANSPARENT PLASTIC IN A SOLVENT TO ENCAPSULATE SAID LAYER, SAID LAYER BEING SUBSTANTIALLY INSOLUBLE IN SAID SOLVENT, WHEREBY ONLY SAID LAYER IS COVERED WHILE THE REMAINDER OF SAID ELEMENT IS EXPOSED; AND OBSERVING THE APPEARANCE OF COLOR CHANGE IN SAID LAYER IS AN INDICATION OF TEMPERATURE CHANGE.
Claim 2
Independent Claim
104 words
A METHOD OF DETECTING TEMPERATURE CHANGE COMPRISING THE STEPS OF: APPLYING TO A HEAT GENERATING ELEMENT A LAYER OF A THERMOCHROMIC MIXTURE OF AN ELECTRON DONOR COMPOUND AND ELECRON ACCEPTOR COMPOUND THAT FORMS A WEAKLY ASSOCIATED COLOR COMPLEX IN THE LIQUID STATE; SEALING SAID LAYER TO SAID ELEMENT BY APPLYING TO SAID LAYER A SOLUTION OF A TRANSPARENT PLASTIC IN A SOLVENT TO ENCAPSULATE SAID LAYER, SAID LAYER BEING SUBSTANTIALLY INSOLUBLE IN SAID SOLVENT, WHEREBY ONLY SAID LAYER IS COVERED WHILE THE REMAINDER OF SAID ELEMENT IS EXPOSED; AND OBSERVING THE APPEARANCE OF COLOR CHANGE IN SAID LAYER IS AN INDICATION OF TEMPERATURE CHANGE.
Claim 3
Dependent Claim
16 words
A method according to claim 1 in which said heat generating element comprises a micro-electronic component.
Claim 4
Dependent Claim
17 words
A method according to claim 1 in which said heat generating element is an integrated circuit device.
Claim 5
Dependent Claim
43 words
A method according to claim 1 in which said layer of a thermochromic mixture constitutes a first layer whose color changes at a first temperature and a second layer whose color changes at a second temperature which is higher than said first temperature.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |