US3585809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorption refrigeration machine
Assignee: Carrier Corp
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Filing: 1969-05-01
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Granted: 1971-06-22
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Expires: 1989-05-01
Abstract
Abstract An aqua-ammonia absorption refrigeration system employing an ammonia sensor in the chilled water circuit to detect the presence of ammonia therein and shut down the system to prevent serious corrosion of the chilled water circuit by ammonia.
Inventors
- 👤 Earl L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:30
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/04; F25B15/00; F25B15/02; F25B15/04; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
An aqua-ammonia absorption refrigeration machine having a generator, a condenser, an absorber and an evaporator connected to provide refrigeration, an electrical control circuit including an ammonia sensor associated with said machine to control the operation thereof, said ammonia sensor including a brass sensing element disposed in a position to sense an ammonia leak in said evaporator, said brass element forming an electrically conductive portion of said control circuit which corrodes rapidly in the presence of ammonia to open said electrical control circuit and shut off the machine.
Claim 2
Dependent Claim
87 words
An aqua-ammonia absorption refrigeration machine having a generator, a condenser, an absorber and an evaporator connected to provide refrigeration, an electrical control circuit including an ammonia sensor associated with said machine to control the operation thereof, said ammonia sensor including a brass sensing element disposed in a position to sense an ammonia leak in said evaporator, said brass element forming an electrically conductive portion of said control circuit which corrodes rapidly in the presence of ammonia to open said electrical control circuit and shut off the machine.
Claim 3
Dependent Claim
22 words
An aqua-ammonia absorption refrigeration machine according to claim 1 further including means to stress said element to increase the corrosion rate thereof.
Claim 4
Dependent Claim
27 words
An aqua-ammonia absorption refrigeration machine according to claim 2 wherein said sensing element is a brass wire, and said means for stressing said element includes a spring.
Claim 5
Dependent Claim
149 words
An aqua-ammonia absorption refrigeration machine according to claim 3 wherein said ammonia sensor includes a housing having a central recess formed therein, said housing having two passageways extEnding therethrough parallel to the recess therein and on opposite sides thereof, said spring being disposed in the recess, means adapted for engagement with said spring for movement axially within the recess, said brass wire being disposed within said housing having one end thereof in each passageway and forming a loop over said engagement means, the ends of said wire being suitably secured within the passageways so that said engagement means is held within the recess in said housing against said spring, said wire being stressed by said spring and said engagement means so that when said wire is exposed to ammonia and is weakened thereby, said spring will exert sufficient force to break said wire to open said electrical control circuit.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |