US3732394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron
Assignee: ISSAAC BRAITHWAITE AND SON ENGIN
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Filing: 1971-02-17
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Granted: 1973-05-08
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Expires: 1991-02-17
Abstract
Abstract An iron including heating means and a sole plate wherein means for controlling the heating means is provided in the sole plate.
Inventors
- 👤 M Cusworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:09
CPC Classifications
D; D06; D06F; D06F75/00; D06F75/08; D06F75/26; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
In combination: an iron having electrical heating means energizable from an electric current source and adapted to heat a sole plate, and a control circuit for said iron comprising, a temperature sensitive element responsive to the temperature of said sole plate to exhibit a change in an electrical value thereof, a capacitor, means responsive to a change in the electrical value of said element to effect charging of said capacitor, first switching means actuatable in response to discharge of said capacitor, and second switching means actuatable in response to actuation of said first switching means to connect said heating means for energization from said source.
Claim 2
Dependent Claim
105 words
In combination: an iron having electrical heating means energizable from an electric current source and adapted to heat a sole plate, and a control circuit for said iron comprising, a temperature sensitive element responsive to the temperature of said sole plate to exhibit a change in an electrical value thereof, a capacitor, means responsive to a change in the electrical value of said element to effect charging of said capacitor, first switching means actuatable in response to discharge of said capacitor, and second switching means actuatable in response to actuation of said first switching means to connect said heating means for energization from said source.
Claim 3
Dependent Claim
21 words
A control circuit according to claim 1 including adjustable variable resistance means to regulate the rate of charge of said capacitor.
Claim 4
Dependent Claim
61 words
A control circuit according to claim 1 wherein said capacitor is repeatedly charged and discharged in response to a charge in the resistance of said element and wherein said second switching means is actuatable repeatedly in response thereto to provide repeated connection of said heating means to said source whereby power pulses are supplied to said heating means from said source.
Claim 5
Dependent Claim
51 words
A control circuit according to claim 3 wherein said means responsive to a charge in the resistance of said element to effect charging of said capacitor comprises a transistor; wherein said first switching means comprises a unijunction transistor; and wherein said second switching means comprises a triac type solid state device.
Claim 6
Dependent Claim
22 words
A control circuit according to claim 4 wherein said unijunction transistor is coupled to said triac type device by pulse transformer means.
Claim 7
Dependent Claim
38 words
A control circuit according to claim 5 including rectifying means energizable from said electric current source, and wherein said temperature sensitive resistance element, said capacitor, said transistor and said unijunction transistor are in circuit with said rectifying means.
References Cited (Backward Citations)
US2694766A
Cited
US3286077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |