Patent US5799284A successfully refreshed from Google Patents.
Patent US4287753A successfully refreshed from Google Patents.
US4287753A
Expired / Lapsed
US
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Automatic moisture controller with stack sensor
Assignee: ROSCO MACHINERY Co Inc
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Filing: 1980-07-24
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Granted: 1981-09-08
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Expires: 2000-07-24
Abstract
Abstract A moisture detector and controller including a pair of spaced-apart plates positioned in a moist air duct, a cleaner positioned between the plate surfaces adapted to wipe them upon initiation and termination of air flow, and an associated circuit effective to measure the resistance between the plates and compare it with a preselected reference resistance indicative of a desired humidity of the air present in the duct.
Inventors
- 👤 Frederick W. Grantham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:48
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/048
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
Moisture detecting apparatus comprising: a duct for the passage of moist air; a pair of opposed spaced-apart conductive plates mounted in said duct; a wiper adapted to selectively traverse the facing surfaces of said plates; and sensing means connected to said plates effective to measure the resistance between the plates and provide an indication of relative humidity of the air between the plates.
Claim 2
Dependent Claim
63 words
Moisture detecting apparatus comprising: a duct for the passage of moist air; a pair of opposed spaced-apart conductive plates mounted in said duct; a wiper adapted to selectively traverse the facing surfaces of said plates; and sensing means connected to said plates effective to measure the resistance between the plates and provide an indication of relative humidity of the air between the plates.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein the sensing means comprises a Wheatstone bridge.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2 further including means for generating a signal when the resistance between the plates reaches a predetermined level corresponding to a preselected humidity.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1 wherein the wiper comprises a pivotable flap positioned between the plates.
Claim 6
Dependent Claim
27 words
The apparatus of claim 4 wherein the flap is adapted to be moved across the faces of the plates by the flow of gases in the duct.
Claim 7
Dependent Claim
18 words
The apparatus of claim 1 wherein one opposed surface is formed by an insulated section of said duct.
Claim 8
Dependent Claim
28 words
The apparatus of claim 1 wherein the plates are mounted in a vertical section of the gas exhaust duct of a commercial dryer immediately downstream from the blower.
Claim 9
Dependent Claim
21 words
The apparatus of claim 1 wherein the plates are mounted in the stack duct for exhausting gases from a commercial dryer.
Claim 10
Dependent Claim
21 words
The apparatus of claim 1 wherein the wiper further comprises cleaning means for wiping across the facing surfaces of the plates.
Claim 11
Dependent Claim
27 words
The apparatus of claim 9 wherein the cleaning means further comprises abrasive portions extending from edges of the wiper to contact the facing surfaces of the plates.
Claim 12
Dependent Claim
12 words
The apparatus of claim 10 wherein the abrasive portions comprise wire brushes.
Claim 13
Dependent Claim
37 words
The apparatus of claim 5 wherein the flap is pivotably mounted in an off-center position to develop a counterbalance force effective to restore the flap to a horizontal position upon cessation of gas flow in the duct.
Claim 14
Dependent Claim
42 words
The apparatus of claim 5 wherein the flap is mounted to be pivoted out of position between the faces of the plates when moved by the gas flow in the duct in order to avoid affecting the resistance measurement between the plates.
References Cited (Backward Citations)
US2733607A
Cited
US2407215A
Cited
US2715667A
Cited
US2819614A
Cited
US2904765A
Cited
US2930016A
Cited
US3350941A
Cited
US3467860A
Cited
US3424977A
Cited
US3521376A
Cited
US3436838A
Cited
US3555289A
Cited
US4207562A
Cited
US4221058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |