Patent US3818335A successfully refreshed from Google Patents.
US3818335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for detecting amounts of conductive material on a moving web
Assignee: Brown and Williamson Holdings Inc
•
Filing: 1973-10-09
•
Granted: 1974-06-18
•
Expires: 1993-10-09
Abstract
Abstract Detection of amounts of conductive material applied in patterns of discrete areas in a columnar pattern along an endless, nonconductive web is accomplished through the generation of an interrupted pulsed signal corresponding to the conductivity of the discrete areas between two points and the integration of the pulsed signals into a continuous signal which is compared to a signal of value predetermined to correspond to a desired conductivity value. A means detecting or comparing differences between the value of the generated continuous signal and the signal of predetermined value actuates an alarm or an indicating signal, thereby indicating that improper amounts of material are being applied to the web. A second indicating signal may be generated when smearing of the conductive material occurs along the length of the web.
Inventors
- 👤 G Stungis
- 👤 S Merker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/041; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
142 words
A system for monitoring the amount of conductive material applied in discrete areas which are repeated in a columnar pattern along the length of an endless web having at least one monitoring circuit comprising a. signal generating means including a pair of spaced probes for contacting the discrete areas in the columnar pattern as the web moves thereby, said generating means generating a pulsed signal having an amplitude which is proportional to the conductivity of a discrete area for each discrete area coming into contact with the pair of probes; b. integrating means responsive to the reception of pulsed signals from said generating means for integrating the pulsed signals into continuous signal; and c. comparing means responsive to the continuous signal received from said integrating means for indicating when the value of the integrated signal departs from a predetermined range of values.
Claim 2
Independent Claim
142 words
A system for monitoring the amount of conductive material applied in discrete areas which are repeated in a columnar pattern along the length of an endless web having at least one monitoring circuit comprising a. signal generating means including a pair of spaced probes for contacting the discrete areas in the columnar pattern as the web moves thereby, said generating means generating a pulsed signal having an amplitude which is proportional to the conductivity of a discrete area for each discrete area coming into contact with the pair of probes; b. integrating means responsive to the reception of pulsed signals from said generating means for integrating the pulsed signals into continuous signal; and c. comparing means responsive to the continuous signal received from said integrating means for indicating when the value of the integrated signal departs from a predetermined range of values.
Claim 3
Dependent Claim
26 words
The system of claim 1 including an alarm which is actuated by said comparing means when the continuous signal departs from the predetermined range of values.
Claim 4
Dependent Claim
27 words
The system of claim 1 wherein the comparing means includes a first circuit which is actuated when the continuous signal is less than a first predetermined value.
Claim 5
Dependent Claim
38 words
The system of claim 3 wherein the comparing means includes a second circuit which is actuated when the continuous signal is greater than a second predetermined value, the first predetermined value being less than the second predetermined value.
Claim 6
Dependent Claim
33 words
The system of claim 1 wherein the discrete areas are arranged in a plurality of columns along the length of the endless web and said system has a monitoring circuit for each column.
Claim 7
Dependent Claim
32 words
The system of claim 5 including a detecting means for detecting and indicating the presence of discrete areas which have dimensions along the length of the web greater than a predetermined dimension.
Claim 8
Dependent Claim
90 words
The system of claim 6 wherein the detecting means comprises an electric circuit which includes a pair of spaced, parallel probes positioned at right angles to the direction of web movement and in contact with the web along two lines across the web width, said probes being spaced apart a distance greater than the predetermined dimension of the discrete areas along the length of the web whereby the electric circuit is completed when an area of conductive material having a dimension sufficiently great to simultaneously contact both probes moves therebetween.
Claim 9
Independent Claim
131 words
A method for monitoring the deposition of an endless, non-conductive web of a conductive coating in a preselected pattern having a columnar pattern of discrete areas running the length of the web comprising the steps of a. moving the web continuously by a monitoring position; b. electrically contacting each discrete area as it moves by the monitoring position and generating a series of pulsed signals, each pulse being proportional to the conductivity of a respective discrete area; c. integrating the series of pulsed signals into a continuous signal; and d. generating an indicating signal when the continuous signal deviates from a value predetermined to correspond to a conductivity value for the discrete areas, thereby providing an indication that the deposition of conductive coating has deviated from a desired amount of application.
Claim 10
Independent Claim
131 words
A method for monitoring the deposition of an endless, non-conductive web of a conductive coating in a preselected pattern having a columnar pattern of discrete areas running the length of the web comprising the steps of a. moving the web continuously by a monitoring position; b. electrically contacting each discrete area as it moves by the monitoring position and generating a series of pulsed signals, each pulse being proportional to the conductivity of a respective discrete area; c. integrating the series of pulsed signals into a continuous signal; and d. generating an indicating signal when the continuous signal deviates from a value predetermined to correspond to a conductivity value for the discrete areas, thereby providing an indication that the deposition of conductive coating has deviated from a desired amount of application.
Claim 11
Dependent Claim
35 words
The method of claim 8 wherein the step of electrically contacting and generating further comprises contacting each discrete area with a pair of spaced probes and passing an electrical current therebetween across the discrete area.
Claim 12
Dependent Claim
17 words
The method of claim 8 in which the web has a plurality of columns of discrete areas.
Claim 13
Dependent Claim
97 words
The method of claim 8 including the steps of continuously contacting the width of the web along two lines of contact spaced a distance apart greater than any predetermined discrete area dimension along the length of the web and generating an indicating signal in response to an electric current passing between the lines of contact along a conductive path on the web surface, due to the presence of an area of conductive material having a dimension large enough to contact both lines of contact simultaneously, thereby providing an indication that smearing of the conductive coating has occurred.
Claim 14
Dependent Claim
17 words
The method of claim 8 wherein the web is paper and the conductive coating is sodium chlorate.
Claim 15
Dependent Claim
26 words
The method of claim 8 wherein an indicating signal is generated when the continuous signal has a value above or below a predetermined range of values.
References Cited (Backward Citations)
US1573174A
Cited
US1915028A
Cited
US2377783A
Cited
US2765405A
Cited
US2941144A
Cited
US3602190A
Cited
US3667469A
Cited
US3699972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |