Patent US3354702A successfully refreshed from Google Patents.
US3354702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometric strain analysis
Assignee: AT&T Inc
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Filing: 1965-05-04
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Granted: 1967-11-28
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Expires: 1985-05-04
Abstract
No abstract record available.
Inventors
- 👤 Eisner Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:17
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
THE METHOD OF OBTAINING THE SUM OF THE PRINCIPAL STRAINS AT NUMBEROUS POINTS ON A SURFACE OF AN OBJECT WHICH COMPRISES CALIBRATING A SPECIFIC TRANSPARENT MATERIAL FOR CHANGES IN THICKNESS AND REFRACTIVE INDEX WITH STRAIN, COATING THE SAID SURFACE OF THE OBJECT WITH A THIN FILM OF SAID TRANSPARENT MATERIAL, THE THIN FILM HAVING A THICKNESS OF LESS THAN 0.1 MM. AND HAVING REFLECTIVE COATINGS AT LEAST 94 PERCENT REFLECTING ON ITS MAJOR SURFACES, APPLYING IN COMBINATION MULTIPLE-BEAM INTERFEROMETRIC AND SPECTROSCOPIC TECHNIQUES TO OBTAIN A FIRST PATTERN OF FRINGES OF EQUAL CHROMATIC ORDER FOR A FIRST CONDITION OF STRAIN ON THE OBJECT, SUBJECTING THE OBJECT TO THE STRAINS TO BE INVESTIGATED AND REPEATING THE APPLICATION IN COMBINATION OF THE SAID INTERFEROMETRIC AND SPECTROSCOPIC TECHNIQUES TO OBTAIN A SECOND PATTERN OF FRINGES OF EQUAL CHROMATIC ORDER WHEREBY COMPARISON OF SAID FIRST AND SAID SECOND PATTERNS OF FRINGES PROVIDES INFORMATION RELATIVE TO THE SUM OF THE PRINCIPAL STRAINS AT NUMEROUS POINTS ON THE SURFACE OF THE OBJECT.
Claim 2
Independent Claim
165 words
THE METHOD OF OBTAINING THE SUM OF THE PRINCIPAL STRAINS AT NUMBEROUS POINTS ON A SURFACE OF AN OBJECT WHICH COMPRISES CALIBRATING A SPECIFIC TRANSPARENT MATERIAL FOR CHANGES IN THICKNESS AND REFRACTIVE INDEX WITH STRAIN, COATING THE SAID SURFACE OF THE OBJECT WITH A THIN FILM OF SAID TRANSPARENT MATERIAL, THE THIN FILM HAVING A THICKNESS OF LESS THAN 0.1 MM. AND HAVING REFLECTIVE COATINGS AT LEAST 94 PERCENT REFLECTING ON ITS MAJOR SURFACES, APPLYING IN COMBINATION MULTIPLE-BEAM INTERFEROMETRIC AND SPECTROSCOPIC TECHNIQUES TO OBTAIN A FIRST PATTERN OF FRINGES OF EQUAL CHROMATIC ORDER FOR A FIRST CONDITION OF STRAIN ON THE OBJECT, SUBJECTING THE OBJECT TO THE STRAINS TO BE INVESTIGATED AND REPEATING THE APPLICATION IN COMBINATION OF THE SAID INTERFEROMETRIC AND SPECTROSCOPIC TECHNIQUES TO OBTAIN A SECOND PATTERN OF FRINGES OF EQUAL CHROMATIC ORDER WHEREBY COMPARISON OF SAID FIRST AND SAID SECOND PATTERNS OF FRINGES PROVIDES INFORMATION RELATIVE TO THE SUM OF THE PRINCIPAL STRAINS AT NUMEROUS POINTS ON THE SURFACE OF THE OBJECT.
References Cited (Backward Citations)
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US3246558A
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US3238839A
Cited
GB1025468A
Cited
US3178934A
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FR1400155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |