US3799433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space thermostat with automatic solid state anticipator
Assignee: Robertshaw Controls Co
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Filing: 1973-03-07
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Granted: 1974-03-26
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Expires: 1993-03-07
Abstract
Abstract A space thermostat embodying an automatic solid state anticipator, the anticipator including a parallel diode circuit connected across a heater resistor with the diodes poled in opposite directions and effective to clip the peaks of an A.C. signal applied to the resistor thereby enabling the anticipator to function with diverse power sources having different output voltage and/or current values.
Inventors
- 👤 R Holkeboer
- 👤 F Bauer
- 👤 A Cairo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:05
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
In a thermostat, the combination including a thermostatic element, an anticipator operatively associated with said thermostatic element, said anticipator including an electrical resistance heater disposed adjacent said thermostatic element and effective, when energized, to heat said element, and a pair of oppositely poled rectifiers electrically connected in parallel with said heater and effective to clip the peaks of an A.C. signal applied thereto.
Claim 2
Dependent Claim
63 words
In a thermostat, the combination including a thermostatic element, an anticipator operatively associated with said thermostatic element, said anticipator including an electrical resistance heater disposed adjacent said thermostatic element and effective, when energized, to heat said element, and a pair of oppositely poled rectifiers electrically connected in parallel with said heater and effective to clip the peaks of an A.C. signal applied thereto.
Claim 3
Dependent Claim
23 words
The combination as set forth in claim 1 including means for adjusting the physical position of said heater relative to said thermostatic element.
Claim 4
Dependent Claim
14 words
The combination as set forth in claim 1 wherein said rectifiers are silicon diodes.
Claim 5
Dependent Claim
18 words
The combination as set forth in claim 1 wherein said rectifiers are thermally isolated from said thermostatic element.
Claim 6
Dependent Claim
21 words
The combination as set forth in claim 1 wherein means is provided for thermally insulating said rectifiers from said thermostatic element.
Claim 7
Dependent Claim
71 words
In a furnace control system, the combination including furnace actuator means adapted to be connected to a source of A.C. current, thermostatic switching means, electrical heating means operatively associated with said switching means, and a pair of oppositely poled rectifiers having a predetermined voltage drop and electrically connected in parallel with said heating means, said rectifiers being effective to clip the peaks of an A.C. signal applied to said heating means.
Claim 8
Dependent Claim
71 words
In a furnace control system, the combination including furnace actuator means adapted to be connected to a source of A.C. current, thermostatic switching means, electrical heating means operatively associated with said switching means, and a pair of oppositely poled rectifiers having a predetermined voltage drop and electrically connected in parallel with said heating means, said rectifiers being effective to clip the peaks of an A.C. signal applied to said heating means.
Claim 9
Dependent Claim
25 words
The combination as set forth in claim 6 including means for adjusting the physical position of said heating means relative to said thermostatic switching means.
Claim 10
Dependent Claim
17 words
The combination as set forth in claim 6 wherein said rectifiers include a parallel silicon diode circuit.
Claim 11
Dependent Claim
19 words
The combination as set forth in claim 6 wherein said rectifiers are thermally isolated from said thermostatic switching means.
Claim 12
Dependent Claim
20 words
The combination as set forth in claim 6 including means for thermally insulating said rectifiers from said thermostatic switching means.
Claim 13
Dependent Claim
97 words
A space thermostat for controlling ambient temperature, said thermostat comprising, in combination, a thermally responsive member, a pair of contacts operated by said thermally responsive member from an open position to a closed position upon a decrease in the ambient temperature, an electrical heater mounted adjacent said thermally responsive member and adapted to locally heat said thermally responsive member, and a parallel rectifier circuit connected across said heater and having a pair of rectifiers poled in opposite directions and effective to clip the peaks of an A.C. signal applied to said heater upon closure of said contacts.
Claim 14
Dependent Claim
97 words
A space thermostat for controlling ambient temperature, said thermostat comprising, in combination, a thermally responsive member, a pair of contacts operated by said thermally responsive member from an open position to a closed position upon a decrease in the ambient temperature, an electrical heater mounted adjacent said thermally responsive member and adapted to locally heat said thermally responsive member, and a parallel rectifier circuit connected across said heater and having a pair of rectifiers poled in opposite directions and effective to clip the peaks of an A.C. signal applied to said heater upon closure of said contacts.
Claim 15
Dependent Claim
24 words
The combination as set forth in claim 11 including means for adjusting the physical position of said heater relative to said thermally responsive member.
Claim 16
Dependent Claim
14 words
The combination as set forth in claim 12 wherein said rectifiers are silicon diodes.
Claim 17
Dependent Claim
19 words
The combination as set forth in claim 13 including means thermally isolating said diodes from said thermally responsive member.
References Cited (Backward Citations)
US3063001A
Cited
US3445632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |