US3077858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling and measuring the thickness of thin electrically conductive films
Assignee: General Electric Canada Co
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Filing: 1960-03-17
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Granted: 1963-02-19
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Expires: 1980-03-17
Abstract
No abstract record available.
Inventors
- 👤 Ulug Mehmet Esin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/02; G01B7/06; G01B7/10; G01B7/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN ELECTRICAL APPARATUS FOR GAUGING THE THICKNESS OF A THIN ELECTRICALLY CONDUCTIVE FILM PORTION OF A SANDWICH CONSISTING OF SAID FILM FORMED ON A NON-CONDUCTIVE BASE, FIRST SENSING MEANS ADAPTED TO SENSE SAID SANDWICH AND PROVIDE A FIRST SIGNAL REPRESENTATIVE OF THE THICKNESS OF BOTH SAID THIN ELECTRICALLY CONDUCTIVE FILM AND SAID NONCONDUCTIVE BASE, SECOND SENSING MEANS ADAPTED TO SENSE SAID SANDWICH AND PROVIDE A SECOND SIGNAL REPRESENTATIVE OF THE THICKNESS OF SAID NON-CONDUCTIVE BASE, AND MEANS ADAPTED TO DETERMINE THE DIFFERENCE BETWEEN SAID FIRST AND SECOND SIGNALS TO THEREBY PRODUCE A THIRD SIGNAL REPRESENTATIVE SOLELY OF THE THICKNESS OF SAID THIN ELECTRICALLY CONDUCTIVE FILM.
Claim 2
Dependent Claim
105 words
IN ELECTRICAL APPARATUS FOR GAUGING THE THICKNESS OF A THIN ELECTRICALLY CONDUCTIVE FILM PORTION OF A SANDWICH CONSISTING OF SAID FILM FORMED ON A NON-CONDUCTIVE BASE, FIRST SENSING MEANS ADAPTED TO SENSE SAID SANDWICH AND PROVIDE A FIRST SIGNAL REPRESENTATIVE OF THE THICKNESS OF BOTH SAID THIN ELECTRICALLY CONDUCTIVE FILM AND SAID NONCONDUCTIVE BASE, SECOND SENSING MEANS ADAPTED TO SENSE SAID SANDWICH AND PROVIDE A SECOND SIGNAL REPRESENTATIVE OF THE THICKNESS OF SAID NON-CONDUCTIVE BASE, AND MEANS ADAPTED TO DETERMINE THE DIFFERENCE BETWEEN SAID FIRST AND SECOND SIGNALS TO THEREBY PRODUCE A THIRD SIGNAL REPRESENTATIVE SOLELY OF THE THICKNESS OF SAID THIN ELECTRICALLY CONDUCTIVE FILM.
References Cited (Backward Citations)
US2806204A
Cited
US2793345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |