US3848342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system
Assignee: Eastman Kodak Co
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Filing: 1972-07-24
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Granted: 1974-11-19
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Expires: 1992-07-24
Abstract
Abstract A moisture control system for use in paper making is disclosed as employing a traversing moisture sensor, the traversal time of which is made compatible with the thermal time constant of a dryer stage for such paper.
Inventors
- 👤 E Bartles
- 👤 R Fraim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:36
CPC Classifications
D; D21; D21G; D21G9/00; D21G9/0009; D21G9/0036; Y; Y10; Y10S; Y10S162/00; Y10S162/09; Y10S162/10; Y10S162/11
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
Control apparatus comprising a. heat exchange means having a regulatable temperature; b. signal responsive valve means cooperative with said heat exchange means, and having therewith a certain time constant, said valve means being adapted to regulate such temperature; c. sensing means for producing a signal variable as a function of the moisture of a web dried by said heat exchange means; and d. cyclic gating means for cyclically applying the signal of said sensing means to said valve means, at intervals proportional to said time constant; said cyclic gating means including means for driving said sensing means back and forth across said web, and gate means for use in applying the output signal of said sensing means to said valve means only when said sensing means has a certain widthwise position with respect to said web.
Claim 2
Dependent Claim
136 words
Control apparatus comprising a. heat exchange means having a regulatable temperature; b. signal responsive valve means cooperative with said heat exchange means, and having therewith a certain time constant, said valve means being adapted to regulate such temperature; c. sensing means for producing a signal variable as a function of the moisture of a web dried by said heat exchange means; and d. cyclic gating means for cyclically applying the signal of said sensing means to said valve means, at intervals proportional to said time constant; said cyclic gating means including means for driving said sensing means back and forth across said web, and gate means for use in applying the output signal of said sensing means to said valve means only when said sensing means has a certain widthwise position with respect to said web.
Claim 3
Dependent Claim
52 words
The apparatus of claim 1 wherein said sensing means includes a sensor head and threshold means, said threshold means being adapted to receive said sensor head output signal and produce therefrom an output signal only if the sensor head output signal is outside a predetermined range for said sensor head output signal.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |