Patent US3602294A successfully refreshed from Google Patents.
US3602294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety system to be used in heating or cooling plants
Assignee: Individual
•
Filing: 1969-04-18
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Granted: 1971-08-31
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Expires: 1989-04-18
Abstract
Abstract The system comprises a control device operated by a signal that is equal to the difference between a first signal emitted by a first element responsive to volume variations of the heat transfer fluid contained in the plant, and a second signal emitted by at least a second element responsive to variations of the fluid temperature.
Inventors
- 👤 Leon J Wanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:33
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1009; Y; Y10; Y10S; Y10S165/00; Y10S165/001; Y10S165/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
209 words
A safety system for monitoring an excess or lack of fluid in heading or cooling plants comprising: a. a boiler; b. heat exchanger means; c. temperature sensing means for sensing the temperature of the fluid in said heat exchanger means; d. tubing means interconnecting said boiler means and said heat exchanger means for forming a closed circuit; e. an expansion vessel connected to said closed circuit, said expansion vessel containing a float responsive to the level of said fluid in said expansion vessel; and f. an electrical safety circuit means comprising a series circuit of 1. an electrical power supply; 2. a first variable resistance means connected to said float for producing a resistance indicative of the position of said float; 3. second variable resistance means connected to said temperature sensing means for producing a resistance indicative of the temperature of said fluid in said heat exchanger means; 4. a relay means comprising a coil and an armature wherein the current in said armature is a function of the resistance of said first and second variable means, whereby said armature is moved in accordance with the current in said coil; and 5. means coupled to said armature for providing an indication in response to the movement of said armature.
Claim 2
Dependent Claim
209 words
A safety system for monitoring an excess or lack of fluid in heading or cooling plants comprising: a. a boiler; b. heat exchanger means; c. temperature sensing means for sensing the temperature of the fluid in said heat exchanger means; d. tubing means interconnecting said boiler means and said heat exchanger means for forming a closed circuit; e. an expansion vessel connected to said closed circuit, said expansion vessel containing a float responsive to the level of said fluid in said expansion vessel; and f. an electrical safety circuit means comprising a series circuit of 1. an electrical power supply; 2. a first variable resistance means connected to said float for producing a resistance indicative of the position of said float; 3. second variable resistance means connected to said temperature sensing means for producing a resistance indicative of the temperature of said fluid in said heat exchanger means; 4. a relay means comprising a coil and an armature wherein the current in said armature is a function of the resistance of said first and second variable means, whereby said armature is moved in accordance with the current in said coil; and 5. means coupled to said armature for providing an indication in response to the movement of said armature.
Claim 3
Dependent Claim
20 words
a first variable resistance means connected to said float for producing a resistance indicative of the position of said float;
Claim 4
Dependent Claim
20 words
a first variable resistance means connected to said float for producing a resistance indicative of the position of said float;
Claim 5
Dependent Claim
56 words
The system of claim 1 wherein a. said heat exchanger means comprises a plurality of heat exchangers; b. said temperature sensing means comprises one temperature sensing means for each of one of said plurality of heat exchangers; and c. said second variable resistance means comprises one variable resistance means for each of said temperature sensIng means.
Claim 6
Dependent Claim
26 words
second variable resistance means connected to said temperature sensing means for producing a resistance indicative of the temperature of said fluid in said heat exchanger means;
Claim 7
Dependent Claim
26 words
second variable resistance means connected to said temperature sensing means for producing a resistance indicative of the temperature of said fluid in said heat exchanger means;
Claim 8
Dependent Claim
42 words
a relay means comprising a coil and an armature wherein the current in said armature is a function of the resistance of said first and second variable means, whereby said armature is moved in accordance with the current in said coil; and
Claim 9
Dependent Claim
42 words
a relay means comprising a coil and an armature wherein the current in said armature is a function of the resistance of said first and second variable means, whereby said armature is moved in accordance with the current in said coil; and
Claim 10
Dependent Claim
17 words
means coupled to said armature for providing an indication in response to the movement of said armature.
Claim 11
Dependent Claim
17 words
means coupled to said armature for providing an indication in response to the movement of said armature.
References Cited (Backward Citations)
US3272258A
Cited
US3236292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |