US3336212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condition responsive device
Assignee: Honeywell Inc
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Filing: 1964-09-01
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Granted: 1967-08-15
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Expires: 1984-09-01
Abstract
No abstract record available.
Inventors
- 👤 Merle E Nicholas
- 👤 James J Renier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:08
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/02; G01K3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
A DEVICE FOR VISUALLY INDICATING THE EXTENT TO WHICH SUBSTANCES HAVE BEEN EXPOSED TO A TEMPERATURE EXCEEDING A SAFE PREDETERMINED MINIMUM COMPRISING A POROUS MEDIUM CONTAINING AN ELECTROLYTE COMPOSITION WHICH CHANGES COLOR UPON CONTACT WITH IONS MIGRATING ACROSS SAID MEDIUM TO PRODUCE A COLOR CONVERTED AREA THEREUPON, A FIRST METAL BODY IN CONTACT WITH DAID MEDIUM NEAR ONE END THEREOF, A SECOND DISSIMILAR METAL BODY IN CONTACT WITH SAID MEDIUM NEAR THE OTHER END THEREOF, AND A METALLIC CONDUCTOR CONNECTING SAID METAL BODIES, SAID ELECTROLYTE COMPOSITION BEING CAPABLE OF ELECTROLYTICALLY REACTING WITH SAID FIRST METAL BODY TO FORM IONS WHICH MIGRATE THROUGH SAID MEDIUM AT A RATE PROPORTIONAL TO TIME AND TO THEINCREAS IN TEMPERATURE AOVE SAID PREDETERMINED MINIMUM AND WHICH IONS PRODUCE A COLOR CHANGE IN SAID ELECTROLYTE COMPOSITION DURING MIGRATION, SAID ELECTROLYTE COMPOSITION BEING PARTICULARLY CHARACTERIZED IN THAT IT INCLUDES A QUANTITY OF A COMPLEXING AGENT TO PREVENT THE INTERACTION OF SAID MIGRATING IONS WITH OTHER REACTION PRODUCTS PRODUCED BY THE ELECTROLYTIC ACTION IN SAID DEVICE AT SAID METAL BODIES THUS INCREASING THE DELINEATION OF THE LEADING EDGE OF SAID COLOR CONVERTED AREA IN SAID ELECTROLYTE ON SAID MEDIUMAND INCREASING THE MIGRATION DISTANCE OF SAID MIGRATING IONS.
Claim 2
Independent Claim
199 words
A DEVICE FOR VISUALLY INDICATING THE EXTENT TO WHICH SUBSTANCES HAVE BEEN EXPOSED TO A TEMPERATURE EXCEEDING A SAFE PREDETERMINED MINIMUM COMPRISING A POROUS MEDIUM CONTAINING AN ELECTROLYTE COMPOSITION WHICH CHANGES COLOR UPON CONTACT WITH IONS MIGRATING ACROSS SAID MEDIUM TO PRODUCE A COLOR CONVERTED AREA THEREUPON, A FIRST METAL BODY IN CONTACT WITH DAID MEDIUM NEAR ONE END THEREOF, A SECOND DISSIMILAR METAL BODY IN CONTACT WITH SAID MEDIUM NEAR THE OTHER END THEREOF, AND A METALLIC CONDUCTOR CONNECTING SAID METAL BODIES, SAID ELECTROLYTE COMPOSITION BEING CAPABLE OF ELECTROLYTICALLY REACTING WITH SAID FIRST METAL BODY TO FORM IONS WHICH MIGRATE THROUGH SAID MEDIUM AT A RATE PROPORTIONAL TO TIME AND TO THEINCREAS IN TEMPERATURE AOVE SAID PREDETERMINED MINIMUM AND WHICH IONS PRODUCE A COLOR CHANGE IN SAID ELECTROLYTE COMPOSITION DURING MIGRATION, SAID ELECTROLYTE COMPOSITION BEING PARTICULARLY CHARACTERIZED IN THAT IT INCLUDES A QUANTITY OF A COMPLEXING AGENT TO PREVENT THE INTERACTION OF SAID MIGRATING IONS WITH OTHER REACTION PRODUCTS PRODUCED BY THE ELECTROLYTIC ACTION IN SAID DEVICE AT SAID METAL BODIES THUS INCREASING THE DELINEATION OF THE LEADING EDGE OF SAID COLOR CONVERTED AREA IN SAID ELECTROLYTE ON SAID MEDIUMAND INCREASING THE MIGRATION DISTANCE OF SAID MIGRATING IONS.
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) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |