Patent US3283576A successfully refreshed from Google Patents.
US3283576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for detecting change of heat transfer rate
Assignee: United Control Corp
•
Filing: 1963-10-07
•
Granted: 1966-11-08
•
Expires: 1983-10-07
Abstract
No abstract record available.
Inventors
- 👤 Halpin Lawrence Wayne
- 👤 Eugene B Seeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:12
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/246; G01F23/247
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
MEANS FOR DETECTING CHANGE OF LIQUID LEVEL THROUGH A GIVEN POINT, COMPRISING A TEMPERATURE SENSITIVE ELEMENT MOUNTED ON SAID POINT, A DIFFERENTIAL AMPLIFIER HAVING AN OUTPUT AND TWO OPPPOSING INPUTS, ONE SUCH INPUT BEING CONNECTED ACROSS THE ELEMENT AND THE OTHER INPUT HAVING AN FIRST RESISTANCE THEREIN, AMPLIFIER MEANS HAVING AN OUTPUT CONNECTED TO THE ELEMENT FOR CONTROLLING HEATING CURRENT THEREIN AND HAVING AN INPUT TO WHIHC THE DIFFERENTIAL AMPLIFIER OUTPUT IS CONNECTED, A SECOND RESISTANCE CONNECTED IN THE LOAD CIRCUIT OF SAID AMPLIDIER MEANS TO DEVELOP A VOLTAGE PROPORTIONAL TO SUCH HEATING CURRENT, AND ADDITIONAL AMPLIFIER MEANS HAVING AN INPUT CONNECTED TO SAID SECOND RESISTANCE TO BE SUBJECT TO SAID VOLTAGE AND HAVING A LOAD CIRCUIT INCLUDING SAID FIRST RESISTANCE TO PRODUCE A VOLTAGE DROP IN THE LATTER PROPORTIONAL TO SAID VOLTAGE
Claim 2
Dependent Claim
133 words
MEANS FOR DETECTING CHANGE OF LIQUID LEVEL THROUGH A GIVEN POINT, COMPRISING A TEMPERATURE SENSITIVE ELEMENT MOUNTED ON SAID POINT, A DIFFERENTIAL AMPLIFIER HAVING AN OUTPUT AND TWO OPPPOSING INPUTS, ONE SUCH INPUT BEING CONNECTED ACROSS THE ELEMENT AND THE OTHER INPUT HAVING AN FIRST RESISTANCE THEREIN, AMPLIFIER MEANS HAVING AN OUTPUT CONNECTED TO THE ELEMENT FOR CONTROLLING HEATING CURRENT THEREIN AND HAVING AN INPUT TO WHIHC THE DIFFERENTIAL AMPLIFIER OUTPUT IS CONNECTED, A SECOND RESISTANCE CONNECTED IN THE LOAD CIRCUIT OF SAID AMPLIDIER MEANS TO DEVELOP A VOLTAGE PROPORTIONAL TO SUCH HEATING CURRENT, AND ADDITIONAL AMPLIFIER MEANS HAVING AN INPUT CONNECTED TO SAID SECOND RESISTANCE TO BE SUBJECT TO SAID VOLTAGE AND HAVING A LOAD CIRCUIT INCLUDING SAID FIRST RESISTANCE TO PRODUCE A VOLTAGE DROP IN THE LATTER PROPORTIONAL TO SAID VOLTAGE
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |