US3237156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature-indicating device
Assignee: Findlay Irvine Ltd
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Filing: 1962-07-19
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Granted: 1966-02-22
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Expires: 1982-07-19
Abstract
No abstract record available.
Inventors
- 👤 Irvine John Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:38
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A TEMPERATURE-INDICATING DEVICE COMPRISING: (A) A TEMPERATURE-SENSITIVE TRANSISTOR SO CONNECTED THAT ITS COLLECTOR VOLTAGE IS DEPENDENT UPON THE AMBIENT TEMPERATURE, (B) AN INDICATOR DEVICE, (C) A SECOND TRANSISTOR, (D) FIRST MEANS CONNECTING SAID TEMPERATURE-SENSITIVE TRANSISTOR TO SAID SECOND TRANSISTOR TO CAUSE SAID SECOND TRANSISTOR TO BE IN A FIRST STABLE STATE WHEN THE TEMPERATURE IS ABOVE A FIRST LEVEL, TO BE IN A SECOND STABLE STATE WHEN THE TEMPERATURE IS BELOW A SECOND AND LOWER LEVEL AND TO OSCILLATE BETWEEN THE SAID
Claim 2
Dependent Claim
82 words
A TEMPERATURE-INDICATING DEVICE COMPRISING: (A) A TEMPERATURE-SENSITIVE TRANSISTOR SO CONNECTED THAT ITS COLLECTOR VOLTAGE IS DEPENDENT UPON THE AMBIENT TEMPERATURE, (B) AN INDICATOR DEVICE, (C) A SECOND TRANSISTOR, (D) FIRST MEANS CONNECTING SAID TEMPERATURE-SENSITIVE TRANSISTOR TO SAID SECOND TRANSISTOR TO CAUSE SAID SECOND TRANSISTOR TO BE IN A FIRST STABLE STATE WHEN THE TEMPERATURE IS ABOVE A FIRST LEVEL, TO BE IN A SECOND STABLE STATE WHEN THE TEMPERATURE IS BELOW A SECOND AND LOWER LEVEL AND TO OSCILLATE BETWEEN THE SAID
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |