Patent US3709970A successfully refreshed from Google Patents.
Patent US3586822A successfully refreshed from Google Patents.
US3586822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric boiler
Assignee: Argo Industries Inc
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Filing: 1968-01-15
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Granted: 1971-06-22
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Expires: 1988-01-15
Abstract
Abstract A prewired, unit-handled electric water boiler having a boiler casting housing a plurality of immersible heater elements, a removable control panel on which all the circuit elements are mounted including sequentially activable heater control relays and individual pilot lights for indicating energization of each heater element.
Inventors
- 👤 Michael W Pastore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:46
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/225
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
A prewired, unit handled electric water boiler unit comprising: a heater housing having an inlet end and an outlet end through which water passes to be heated; heater elements positioned within said housing to be immersed in the water; means for carrying electric circuit elements and their wiring, said means being removably mounted upon said housing in spaced relationship thereto; a temperature sensing probe positionable within said heater housing adjacent the outlet end thereof; and dual adjustable controls comprising a first selector means for defining a range of acceptable operating temperatures and a second selector means for limiting the maximum operating temperature, said first selector means being operationally connected to a first line switch to open said first switch to prevent operation of said boiler unit when said probe senses a temperature outside of the range defined by said first selector means, and said second selector means being operationally connected to a second line switch to open said second switch to prevent operation of said boiler unit when said probe senses a temperature above the maximum temperature as set on said second selector means.
Claim 2
Dependent Claim
184 words
A prewired, unit handled electric water boiler unit comprising: a heater housing having an inlet end and an outlet end through which water passes to be heated; heater elements positioned within said housing to be immersed in the water; means for carrying electric circuit elements and their wiring, said means being removably mounted upon said housing in spaced relationship thereto; a temperature sensing probe positionable within said heater housing adjacent the outlet end thereof; and dual adjustable controls comprising a first selector means for defining a range of acceptable operating temperatures and a second selector means for limiting the maximum operating temperature, said first selector means being operationally connected to a first line switch to open said first switch to prevent operation of said boiler unit when said probe senses a temperature outside of the range defined by said first selector means, and said second selector means being operationally connected to a second line switch to open said second switch to prevent operation of said boiler unit when said probe senses a temperature above the maximum temperature as set on said second selector means.
Claim 3
Dependent Claim
125 words
A prewired, unit handled electric water boiler unit comprising: a heater housing having an inlet end and an outlet end through which water passes to be heated; heater elements positioned within said housing to be immersed in the water; means for carrying electric circuit elements and their wiring, said means being removably mounted upon said housing in spaced relationship thereto; and electric circuit elements of the plug-in type mounted on said means; said electric circuit elements including temperature sensing master control means for controlling the supplying of power to said heater elements; individual power relays operationally connected to each of said heater elements to energize said heater elements when said power relays are energized; and thermal time delay relays which sequentially energize said power relays.
Claim 4
Dependent Claim
125 words
A prewired, unit handled electric water boiler unit comprising: a heater housing having an inlet end and an outlet end through which water passes to be heated; heater elements positioned within said housing to be immersed in the water; means for carrying electric circuit elements and their wiring, said means being removably mounted upon said housing in spaced relationship thereto; and electric circuit elements of the plug-in type mounted on said means; said electric circuit elements including temperature sensing master control means for controlling the supplying of power to said heater elements; individual power relays operationally connected to each of said heater elements to energize said heater elements when said power relays are energized; and thermal time delay relays which sequentially energize said power relays.
Claim 5
Dependent Claim
43 words
The electric water boiler unit defined in claim 2 wherein said heater elements are protected with individual line circuit breakers mounted on said carrying means and wherein pilot lights for indicating the condition of said heater elements are mounted on said carrying means.
Claim 6
Dependent Claim
48 words
The electric water boiler unit defined in claim 2 wherein a cover is positioned over said housing and said carrying means and has openings therein for exposing the faces of said circuit breakers and said pilot lights whereby the condition of said heaters may be easily visually checked.
Claim 7
Dependent Claim
46 words
The electric water boiler defined in claim 2 wherein said heater housing is a cast metal body having internal baffles positioned to cause the water to flow through said housing in a serpentine path and defining parallel heater chambers in which said heater elements are disposed.
Claim 8
Dependent Claim
64 words
The electric water boiler unit defined in claim 2 wherein: said carrying means includes a planar control panel made of a dielectric material having said electric circuit elements mounted on one face thereof and said circuit wiring mounted on the opposite face thereof; and a plurality of plug-in type sockets are secured to said control panel to receive said plug-in type electric circuit elements.
Claim 9
Dependent Claim
38 words
The electric water boiler unit defined in claim 2 further including individual auxiliary relay means electrically connected to each of said heater elements controlling the energization of safety pilot lights to indicate the deterioration of said heater elements.
Claim 10
Dependent Claim
42 words
The electric water boiler unit defined in claim 7 wherein each of said auxiliary relay means comprises an operating coil connected in electrical series relationship with its associated heater element, and switch means operable by said coil to control said pilot lights.
Claim 11
Dependent Claim
53 words
The electric water boiler unit defined in claim 7 wherein said pilot lights include two banks thereof, the pilot lights of one bank being energized when said heater elements are operating normally and the pilot lights of the second bank being individually energizable in response to the deterioration of said individual heater elements.
References Cited (Backward Citations)
No citation records indexed.
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 |