US3839616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for producing heating of moisture-containing objects
Assignee: Husqvarna Vapenfabriks AB
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Filing: 1973-02-13
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Granted: 1974-10-01
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Expires: 1993-02-13
Abstract
Abstract A method for the periodic heating of a moisture-containing object is disclosed whereby the change in humidity of the moisture, liberated when the object is heated, is measured by a measuring process and converted to a measuring quantity which controls the heating power fed to the object; a device is also disclosed for carrying out the method.
Inventors
- 👤 P Risman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6447; H05B6/6458
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A method for applying periodic microwave heating to a moisture-containing object comprising the steps of: a. heating the object to liberate moisture; b. measuring the changes in humidity caused by the liberated moisture; c. converting the measured changes to a first measuring quantity; d. cutting off the heat supplied to the object using said first measuring quantity whereby the object begins to cool; e. measuring the consequent changes in humidity liberated from the object; f. converting the measured consequent changes to a second measuring quantity; g. resupplying heat to the object utilizing said second measuring quantity to thereby increase the humidity liberated from the object; and h. continuously repeating steps (b) through (g) to thereby apply periodic heating to the moisture-containing object.
Claim 2
Independent Claim
122 words
A method for applying periodic microwave heating to a moisture-containing object comprising the steps of: a. heating the object to liberate moisture; b. measuring the changes in humidity caused by the liberated moisture; c. converting the measured changes to a first measuring quantity; d. cutting off the heat supplied to the object using said first measuring quantity whereby the object begins to cool; e. measuring the consequent changes in humidity liberated from the object; f. converting the measured consequent changes to a second measuring quantity; g. resupplying heat to the object utilizing said second measuring quantity to thereby increase the humidity liberated from the object; and h. continuously repeating steps (b) through (g) to thereby apply periodic heating to the moisture-containing object.
Claim 3
Independent Claim
105 words
A device for producing periodic microwave heating of a moisture-containing object comprising: a heating chamber; microwave heating means having a power feed circuit and disposed in said chamber; fan means arranged to be in interworking relationship with said chamber; a moisture-sensitive resistance means disposed in close proximity to the object and mounted so as to be in the path of the airstream produced by said fan means, which airstream contains the moisture liberated by the object when heated by said heating means, said moisture-sensitive resistance means being operatively responsive to the moisture in the air-stream for periodically controlling the power fed to said heating means.
Claim 4
Independent Claim
105 words
A device for producing periodic microwave heating of a moisture-containing object comprising: a heating chamber; microwave heating means having a power feed circuit and disposed in said chamber; fan means arranged to be in interworking relationship with said chamber; a moisture-sensitive resistance means disposed in close proximity to the object and mounted so as to be in the path of the airstream produced by said fan means, which airstream contains the moisture liberated by the object when heated by said heating means, said moisture-sensitive resistance means being operatively responsive to the moisture in the air-stream for periodically controlling the power fed to said heating means.
Claim 5
Dependent Claim
22 words
A device as claimed in claim 2 wherein said moisture-responsive resistance means is composed of a lithium chloride cell with two electrodes.
Claim 6
Dependent Claim
69 words
A device as claimed in claim 3 wherein said lithium chloride cell is connected to an amplifier coupling comprising a transistor controlling a relay in the power feed circuit to said heating means, said transistor being set into conduction by a control current produced by a circuit containing a Zener diode, said Zener diode being fed by a voltage through a resistance connected in series with said moisture-sensitive means.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |