US4168465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tapered hole capacitive probe
Assignee: United States Department of the Air Force
•
Filing: 1977-12-15
•
Granted: 1979-09-18
•
Expires: 1997-12-15
Abstract
Abstract A tapered capacitive probe embodies vertical stripes for detecting irregular flaws in metal holes. Horizontal stripes are added to the probe and connected in a one-to-one relationship with the vertical stripes to detect and measure flaws with angular uniformity. Invention allows flaws to be detected in vertical, horizontal or angular direction and discloses approximate shapes and locations.
Inventors
- 👤 Morris D. Prince
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:41
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/24; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
An improved tapered hole capacitive probe comprising: A base having a long generally cylindrically shape tapering toward one end and formed of an electrically insulating material; a plurality of electrically conductive segments affixed to the base and spaced at equal distances around the circumference of the probe, each segment lying essentially parallel to the longitudinal axis of the probe, a like number of electrically conductive segments of ring-like, electrically conductive, segments affixed to the base and equally spaced along the longitudinal axis of the probe, and lying in a plane transverse to the longitudinal axis; means for electrically connecting selected parallel and transverse segments together in a sequential manner, and means for connecting said segments to a data receiving means.
Claim 2
Dependent Claim
120 words
An improved tapered hole capacitive probe comprising: A base having a long generally cylindrically shape tapering toward one end and formed of an electrically insulating material; a plurality of electrically conductive segments affixed to the base and spaced at equal distances around the circumference of the probe, each segment lying essentially parallel to the longitudinal axis of the probe, a like number of electrically conductive segments of ring-like, electrically conductive, segments affixed to the base and equally spaced along the longitudinal axis of the probe, and lying in a plane transverse to the longitudinal axis; means for electrically connecting selected parallel and transverse segments together in a sequential manner, and means for connecting said segments to a data receiving means.
Claim 3
Dependent Claim
26 words
An improved tapered hole capacitive probe according to claim 1 wherein said electrically conductive segments are insulated from all segments other than the said selected segments.
Claim 4
Dependent Claim
37 words
An improved tapered hole capacitive probe according to claim 1 wherein the number of leads required to connect said electrically conductive segments to a data receiving means is equal to one-half the total number of said segments.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |