US3229196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring device and method
Assignee: Ilford Imaging UK Ltd
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Filing: 1963-04-26
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Granted: 1966-01-11
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Expires: 1983-04-26
Abstract
No abstract record available.
Inventors
- 👤 Manktelow Denis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01R; G01R33/00; G01R33/12; G01R33/1207; G01V; G01V3/00; G01V3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD OF MEASURING THE AMOUNT OF MAGNETIC OXIDE OF IRON APPLIED TO A SUBSTRATE, WHICH METHOD COMPRISES CYCLICALLY MOVING AT LEAST THE FERROMAGNETIC CORE ON WHICH IS WOUND THE COIL OF A FIRST OSCILLATOR SO THAT A GAP IN THE CORE ALTERNATELY EMBRACES AND FAILS TO EMBRACE PART OF THE SUBSTRATE CARRYING THE SAID OXIDE, MIXING THE OUTPUT OF SAID OSCILLATOR WITH THE OUTPUT OF A SECOND OSCILLATOR TO PRODUCE A BEAT FREQUENCY, PASSING SAID BEAT FREQUENCY TO A FREQUENCY DISCRIMINATOR AND MEASURING
Claim 2
Independent Claim
84 words
A METHOD OF MEASURING THE AMOUNT OF MAGNETIC OXIDE OF IRON APPLIED TO A SUBSTRATE, WHICH METHOD COMPRISES CYCLICALLY MOVING AT LEAST THE FERROMAGNETIC CORE ON WHICH IS WOUND THE COIL OF A FIRST OSCILLATOR SO THAT A GAP IN THE CORE ALTERNATELY EMBRACES AND FAILS TO EMBRACE PART OF THE SUBSTRATE CARRYING THE SAID OXIDE, MIXING THE OUTPUT OF SAID OSCILLATOR WITH THE OUTPUT OF A SECOND OSCILLATOR TO PRODUCE A BEAT FREQUENCY, PASSING SAID BEAT FREQUENCY TO A FREQUENCY DISCRIMINATOR AND MEASURING
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |