Patent US3553668A successfully refreshed from Google Patents.
US3553668A
Expired / Lapsed
US
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Method of and device for detecting surface elevations
Assignee: Individual
•
Filing: 1966-05-02
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Granted: 1971-01-05
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Expires: 1986-05-02
Abstract
Abstract METHOD AND APPARATUS ARE DISCLOSED FOR THE DETECTION OF IRREGULARITIES OF SMALL AREA IN THE THICKNESS OF A MOVING WEB. ELECTRICAL MEANS ARE USED TO DETECT DIFFERENTIAL MOVEMENT BETWEEN TWO FEELER MEANS-A FIRST OF WHICH IS IN CONSTANT CONTACT WITH THE SURFACE OF THE WEB, AND A SECOND OF WHICH IS SUPPORTED BY THE FIRST AT SOME SMALL DISTANCE FROM THE WEB AND IS CONTACTED ONLY BY LOCALIZED SURFACE IRREGULARITIES TO THEREBY PRODUCE DIFFERENTIAL FEELER MOVEMENT. THE ELECTRICAL MEANS ARE DISCLOSED AS CAPACITIVE, INDUCTIVE, AND SWITCH OPERATED.
Inventors
- 👤 Laszlo Urmenyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:45
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/34; G01N33/346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |