Patent US1670418A successfully refreshed from Google Patents.
Patent US2665375A successfully refreshed from Google Patents.
Patent US3919635A successfully refreshed from Google Patents.
US3919635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for detecting holes in dielectric sheet materials
Assignee: KAY-FRIES Inc
•
Filing: 1973-01-19
•
Granted: 1975-11-11
•
Expires: 1993-01-19
Abstract
Abstract A hole detector for processing dielectric webs operates by first charging the web with a primary electrode and then applying a secondary charge with a detector electrode. This permits better control of the arcing through pinholes which is used to detect their presence.
Inventors
- 👤 James Harold Bowen
- 👤 Edward Flowers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:42
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/205; G01R; G01R31/00; G01R31/12; G01R31/1227; G01R31/1263
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
175 words
Apparatus for detecting small holes in a sheet of dielectric material comprising, in combination: electrically conductive means in electrical contact with one surface of said sheet material; an electrical ground in circuit with said electrically conductive means; an electrical charging electrode impinging on the other surface of said sheet material; a first electric power source in circuit with said electrical charging electrode, and said electrical ground for imposing an electrical charge on said other surface of said sheet material; a detector electrode disposed adjacent said other surface of said sheet material in electrical spark gap spaced relationship to the first recited electrically conductive means; a second power source in circuit with said detector electrode; spark detector means in circuit with said detector electrode for detecting the spark gap current flow between said detector electrode and said grounded electrically conductive means when a hole in the sheet material is in registration therewith; and means for continually moving said sheet of dielectric material first into contact with said electrical charging electrode and then past said detector electrode.
Claim 2
Dependent Claim
175 words
Apparatus for detecting small holes in a sheet of dielectric material comprising, in combination: electrically conductive means in electrical contact with one surface of said sheet material; an electrical ground in circuit with said electrically conductive means; an electrical charging electrode impinging on the other surface of said sheet material; a first electric power source in circuit with said electrical charging electrode, and said electrical ground for imposing an electrical charge on said other surface of said sheet material; a detector electrode disposed adjacent said other surface of said sheet material in electrical spark gap spaced relationship to the first recited electrically conductive means; a second power source in circuit with said detector electrode; spark detector means in circuit with said detector electrode for detecting the spark gap current flow between said detector electrode and said grounded electrically conductive means when a hole in the sheet material is in registration therewith; and means for continually moving said sheet of dielectric material first into contact with said electrical charging electrode and then past said detector electrode.
Claim 3
Dependent Claim
29 words
Apparatus according to claim 1 wherein the first recited electrically conductive means is comprised in an electrically conductive substrate contiguous to and continuous with the sheet of dielectric material.
Claim 4
Dependent Claim
26 words
ApParatus according to claim 1 in combination with means to remove the electrical charge imposed on said sheet after said sheet has passed said detector electrode.
Claim 5
Dependent Claim
24 words
Apparatus according to claim 2 wherein said electrically conductive substrate and said sheet of dielectric material are laminae comprised in a sheet material product.
Claim 6
Dependent Claim
34 words
Apparatus according to claim 1 in combination with indicia producing means in circuit with said spark detector means, operably connected thereto to produce sensible indicia in response to signals from the spark detector means.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 5 wherein said indicia producing means is a recorder adapted to produce a continuous graph having marks corresponding to the locations of faults detected in the sheet of dielectric material.
Claim 8
Dependent Claim
32 words
Apparatus according to claim 5 wherein said indicia producing means is a film marking device operably arranged and disposed to mark the locations of detected faults on the sheet of dielectric mataerial.
Claim 9
Dependent Claim
14 words
Apparatus according to claim 5 wherein said indicia producing means is a signaling device.
Claim 10
Independent Claim
104 words
A method for detecting small holes in a sheet of continuously advancing dielectric material comprising the steps of: contacting one surface of said sheet with a grounded electrically conductive element; imposing an electrical charge on the other surface of said sheet; passing said sheet through a gap defined between said grounded electrically conductive element and an electrode; charging said electrode to a potential sufficient to effect discernable spark gap current flow between said electrode and said grounded electrically conductive element when a hole in the sheet material is in registration with the electrode and the grounded electrically conductive element, and detecting said current flow.
Claim 11
Independent Claim
104 words
A method for detecting small holes in a sheet of continuously advancing dielectric material comprising the steps of: contacting one surface of said sheet with a grounded electrically conductive element; imposing an electrical charge on the other surface of said sheet; passing said sheet through a gap defined between said grounded electrically conductive element and an electrode; charging said electrode to a potential sufficient to effect discernable spark gap current flow between said electrode and said grounded electrically conductive element when a hole in the sheet material is in registration with the electrode and the grounded electrically conductive element, and detecting said current flow.
Claim 12
Dependent Claim
28 words
A method according to claim 9 in combination with the stop of removing the first recited electrical charge from the sheet after it has passed through said gap.
Claim 13
Dependent Claim
28 words
A method according to claim 9 in combination with the step of producing discernable indicia proportional to the spark gap current flow between said grounded electrically conductive element.
References Cited (Backward Citations)
US2701336A
Cited
US2890409A
Cited
US2942248A
Cited
US2978636A
Cited
US2941144A
Cited
US2965755A
Cited
US3321703A
Cited
US3358378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |