US3243698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-magnetic surface irregularity detector using magnetic surface coating and magnetic detector
Assignee: Individual
•
Filing: 1963-04-08
•
Granted: 1966-03-29
•
Expires: 1983-04-08
Abstract
No abstract record available.
Inventors
- 👤 Eldred J Haley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:08
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/34; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/83; G01N27/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A SURFACE IRREGULARITY DETECTOR COMPRISING, IN COMBINATION, A MAGNETIC HEAD, MEANS TO CONVEY A NON-MAGNETIC BODY WITH A SUBSTANTIALLY FLAT SURFACE PAST SAID HEAD, SAID SURFACE HAVING A THIN COATING OF MAGNETIZABLE MATERIAL DEPOSITED THEREON BY VACUUM DEPOSITION AND ADHERING THERETO, SAID THIN COATING BEING OF UNIFORM THICKNESS AND MOLDING ITSELF TO THE CONTOURS OF SAID SURFACE, MEANS FOR DETECTING VARIATIONS IN A MAGNETIC FIELD GENERATED BY SAID MAGNETIC HEAD, SAID VARIATIONS IN SAID MAGNETIC FIELD BEING CAUSED BY CHANGES IN THE DISTANCE OF SAID THIN COATING FROM SAID MAGNETIC HEAD AS SAID NON-MAGNETIC BODY IS CONVEYED PAST SAID HEAD, WHEREBY IRREGULARITIES IN THE SUBSTANTIALLY FLAT SURFACE OF SAID NON-MAGNETIC BODY ARE DETECTED.
Claim 2
Dependent Claim
113 words
A SURFACE IRREGULARITY DETECTOR COMPRISING, IN COMBINATION, A MAGNETIC HEAD, MEANS TO CONVEY A NON-MAGNETIC BODY WITH A SUBSTANTIALLY FLAT SURFACE PAST SAID HEAD, SAID SURFACE HAVING A THIN COATING OF MAGNETIZABLE MATERIAL DEPOSITED THEREON BY VACUUM DEPOSITION AND ADHERING THERETO, SAID THIN COATING BEING OF UNIFORM THICKNESS AND MOLDING ITSELF TO THE CONTOURS OF SAID SURFACE, MEANS FOR DETECTING VARIATIONS IN A MAGNETIC FIELD GENERATED BY SAID MAGNETIC HEAD, SAID VARIATIONS IN SAID MAGNETIC FIELD BEING CAUSED BY CHANGES IN THE DISTANCE OF SAID THIN COATING FROM SAID MAGNETIC HEAD AS SAID NON-MAGNETIC BODY IS CONVEYED PAST SAID HEAD, WHEREBY IRREGULARITIES IN THE SUBSTANTIALLY FLAT SURFACE OF SAID NON-MAGNETIC BODY ARE DETECTED.
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |