US3258686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic and optical differential thickness measuring instrument
Assignee: NEOTEC Corp A CORP OF DE
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Filing: 1964-08-28
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Granted: 1966-06-28
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Expires: 1984-08-28
Abstract
No abstract record available.
Inventors
- 👤 Paul J Selgin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
G; G01; G01B; G01B21/00; G01B21/02; G01B21/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A DIFFERENTIAL MEASURING INSTRUMENT FOR DETERMINING THE THICKNESS OF A SHEET OF MATERIAL COMPRISING; AN OPTICAL MEASURING MEANS FOR DETECTING THE TOP SURFACE OF A NONMAGNETIC SHEET, SAID OPTICAL MEANS INCLUDING AN OPTICAL SYSTEM WHICH DIRECTS A BEAM OF LIGHT OVER THE TOP SURFACE OF THE SHEET WITH A PHOTO-SENSITIVE TRANSDUCER WHICH RECEIVES THE BEAM AND DELIVERS A VOLTAGE WHOSE AMPLITUDE IS RESPONSIVE TO THE INTENSITY OF ILLUMINATION RECEIVED; A MAGNETIC MEASURING DEVICE INCLUDING A FERROMAGNETIC CORE HAVING TWO AIR GAPS, AN EXCITING WINDING, AND A DETECTOR WINDING; SAID DETECTOR WINDING PROVIDING AN ALTERNATING CURRENT VOLTAGE RESPONSIVE TO THE LENGTH OF THE AIR GAPS; A FIRST SERVOMOTOR ELECTRICALLY CONNECTED TO SAID PHOTOSENSITIVE TRANSDUCER; A SECOND SERVOMOTOR ELECTRICALLY CONNECTED TO THE DETECTOR WINDING; A GEAR DIFFERENTIAL MECHANICALLY COUPLED TO EACH OF SAID SERVOMOTORS, SAID GEAR DIFFERENTIAL INCLUDING A RESULTANT SHAFT COUPLED TO A VISUAL INDICATOR WHICH IS RESPONSIVE TO THE DIFFERENCE IN SPACING BETWEEN THE OPTICAL MEANS AND THE MAGNETIC DEVICE.
Claim 2
Dependent Claim
160 words
A DIFFERENTIAL MEASURING INSTRUMENT FOR DETERMINING THE THICKNESS OF A SHEET OF MATERIAL COMPRISING; AN OPTICAL MEASURING MEANS FOR DETECTING THE TOP SURFACE OF A NONMAGNETIC SHEET, SAID OPTICAL MEANS INCLUDING AN OPTICAL SYSTEM WHICH DIRECTS A BEAM OF LIGHT OVER THE TOP SURFACE OF THE SHEET WITH A PHOTO-SENSITIVE TRANSDUCER WHICH RECEIVES THE BEAM AND DELIVERS A VOLTAGE WHOSE AMPLITUDE IS RESPONSIVE TO THE INTENSITY OF ILLUMINATION RECEIVED; A MAGNETIC MEASURING DEVICE INCLUDING A FERROMAGNETIC CORE HAVING TWO AIR GAPS, AN EXCITING WINDING, AND A DETECTOR WINDING; SAID DETECTOR WINDING PROVIDING AN ALTERNATING CURRENT VOLTAGE RESPONSIVE TO THE LENGTH OF THE AIR GAPS; A FIRST SERVOMOTOR ELECTRICALLY CONNECTED TO SAID PHOTOSENSITIVE TRANSDUCER; A SECOND SERVOMOTOR ELECTRICALLY CONNECTED TO THE DETECTOR WINDING; A GEAR DIFFERENTIAL MECHANICALLY COUPLED TO EACH OF SAID SERVOMOTORS, SAID GEAR DIFFERENTIAL INCLUDING A RESULTANT SHAFT COUPLED TO A VISUAL INDICATOR WHICH IS RESPONSIVE TO THE DIFFERENCE IN SPACING BETWEEN THE OPTICAL MEANS AND THE MAGNETIC DEVICE.
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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |