US3580070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat meter
Assignee: Individual
•
Filing: 1968-07-11
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Granted: 1971-05-25
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Expires: 1988-07-11
Abstract
Abstract The heat carried by a variable temperature fluid moving at a known rate through a conduit is measured by recording the time required for a conductor thermally coupled to the conduit to lose heat to the conduit from a predetermined higher temperature that is maintained by a heater and a temperature-sensitive switch thermally coupled to the conductor.
Inventors
- 👤 Edward H Cumpston Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:43
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/06; G01K17/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A device for measuring the heat carried by a fluid moving at a known rate through a conduit and having a varying unknown temperature, said device comprising: a. a heat conductor thermally coupled to said fluid conduit to lose heat to said conduit; b. an electric heater thermally coupled to said conductor and spaced from said conduit; c. a temperature-responsive switch thermally coupled to said conductor and spaced from said conduit; d. said switch being arranged for switching said heater on and off to maintain the portion of said conductor in the region of said switch at a predetermined temperature above the temperature of said fluid; and e. means for recording the percent of operating time that said heater is in a predetermined one of its states.
Claim 2
Independent Claim
127 words
A device for measuring the heat carried by a fluid moving at a known rate through a conduit and having a varying unknown temperature, said device comprising: a. a heat conductor thermally coupled to said fluid conduit to lose heat to said conduit; b. an electric heater thermally coupled to said conductor and spaced from said conduit; c. a temperature-responsive switch thermally coupled to said conductor and spaced from said conduit; d. said switch being arranged for switching said heater on and off to maintain the portion of said conductor in the region of said switch at a predetermined temperature above the temperature of said fluid; and e. means for recording the percent of operating time that said heater is in a predetermined one of its states.
Claim 3
Dependent Claim
24 words
The device of claim 1 wherein said recording means is arranged for recording the percent of said operating time that said heater is off.
Claim 4
Dependent Claim
24 words
The device of claim 1 wherein said recording means is arranged for recording the percent of said operating time that said heater is on.
Claim 5
Dependent Claim
17 words
The device of claim 1 wherein said recording means comprises a synchronous motor and a revolution counter.
Claim 6
Dependent Claim
27 words
The device of claim 1 including a pump for forcing said fluid through said conduit and wherein said operating time is the time said pump is running.
Claim 7
Dependent Claim
67 words
A heat meter including a first one of the devices of claim 1 arranged on an input conduit in a heat exchange system and a second one of the devices of claim 1 arranged on an output conduit in said heat exchange system, and said recording means being arranged for recording the time difference of said predetermined states of said heaters of said first and second devices.
Claim 8
Dependent Claim
32 words
The meter of claim 6 wherein a pump is arranged for forcing said fluid through saiD first and second conduits, and said devices are arranged to operate whenever said pump is running.
Claim 9
Dependent Claim
27 words
The meter of claim 7 including relays respectively operated by said switches of said first and second devices for selectively energizing said heaters and said recording means.
Claim 10
Dependent Claim
46 words
The meter of claim 8 wherein said recording means comprises a reversible synchronous motor driven in one direction by said first device and in the opposite direction by said second device, and wherein said relays are arranged for preventing simultaneous opposing drive of said synchronous motor.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |