Patent US3972294A successfully refreshed from Google Patents.
US3586972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical property monitoring probe with pneumatic means for maintaining proximity of probe to moving sheet material
Assignee: Industrial Nucleonics Corp
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Filing: 1968-03-28
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Granted: 1971-06-22
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Expires: 1988-03-28
Abstract
Abstract For monitoring the moisture content of strip material such as paper while it is being manufactured or wound, a dielectric gauge probe is provided including concentric, circular or spiral plates, adjacent circular plates or turns of spiral plates being of opposite polarity, the probe being arranged for edgewise presentment of the plates to the moving strip, a hood being provided about the plates. Negative air pressure maintaining apparatus is communicated to the interior of the hood, and through a passage in the probe to the strip of material for maintaining the probe in desired adjacency with a surface of the strip.
Inventors
- 👤 Harry W Tulleners
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:05
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
202 words
A one-side dielectric guage probe for monitoring the moisture content of a travelling web of material, comprising: a plurality of coaxial, spiral fringe field capacitor plates each having an edge presented downwardly, each plate being curved about a vertical axis and extending angularly throughout at least 360* about that axis; guard means received between the plates to separate the faces of adjacent plates from one another; a downwardly open housing received over the plates and guard means; mounting said plates and said guard means in radially spaced, noncontacting, mutually coaxial relationship with the lower edges of said plates all being substantially level with respect to one another and the lower extents of the guard means and the housing being no lower than the lower edges of said plates; and a negative pneumatic pressure source means communicated through the interior of the housing, above the plates, and among the plates to the web for pulling the web against the probe and for sucking away debris which could otherwise build up between the probe and the web, said negative pressure source means, when the web is pulled against the probe, maintaining a pressure imbalance of about one-tenth pound per square inch below atmospheric pressure.
Claim 2
Dependent Claim
202 words
A one-side dielectric guage probe for monitoring the moisture content of a travelling web of material, comprising: a plurality of coaxial, spiral fringe field capacitor plates each having an edge presented downwardly, each plate being curved about a vertical axis and extending angularly throughout at least 360* about that axis; guard means received between the plates to separate the faces of adjacent plates from one another; a downwardly open housing received over the plates and guard means; mounting said plates and said guard means in radially spaced, noncontacting, mutually coaxial relationship with the lower edges of said plates all being substantially level with respect to one another and the lower extents of the guard means and the housing being no lower than the lower edges of said plates; and a negative pneumatic pressure source means communicated through the interior of the housing, above the plates, and among the plates to the web for pulling the web against the probe and for sucking away debris which could otherwise build up between the probe and the web, said negative pressure source means, when the web is pulled against the probe, maintaining a pressure imbalance of about one-tenth pound per square inch below atmospheric pressure.
Claim 3
Dependent Claim
109 words
The probe of claim 1 wherein the means mounting said plates and said guard means comprises a plurality of rods extending diametrically of and being secured to the housing, the rods being spaced axially and angularly of the housing longitudinal axis from one another; and means securiNg the plates and the guard means to the rods, the rods being exteriorly threaded and the means securing the plates and the guard to the rods comprising means defining lateral openings through the plates and guard, said rods being received through said lateral openings, and stop nuts threadably received on the rods adjacent each side of each plate and guard lateral opening.
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 |