Patent US4405231A successfully refreshed from Google Patents.
US4405231A
Expired / Lapsed
US
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Deformograph
Assignee: Individual
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Filing: 1981-09-22
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Granted: 1983-09-20
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Expires: 2001-09-22
Abstract
Abstract A deformograph comprises a sensitive element shaped as a tube of an optically sensitive material and fixed in a borehole by cementing the gap between said tube and walls of the borehole. One end of the tube is tapered off and provided with a specular coating, while the other end thereof has a specular coating with transparent sections. There are also provided a polarized light source furnishing a light signal transmitted through the material of the tube, and a sensing unit designed to pick off from the sensitive element a useful light signal indicative of the changing condition of the earth's crust in a given area.
Inventors
- 👤 Evgeny I. Shemyakin
- 👤 Gennady I. Kulakov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:48
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/16; G01B11/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A deformograph comprising a polarized light source designed to produce a light signal; a sensitive element shaped as a tube made of an optically sensitive material and fixed in a borehole by cementing the gap between said tube and walls of said borehole, one of ends of said sensitive element being tapered off and provided with a specular coating, while the other end facing said light source has a specular coating with transparent sections enabling passage of a light beam through the material of said sensitive element and its output after being reflected from the specular coating on the tapered end; a sensing unit designed to pick off from said sensitive element a useful light signal indicative of the changing condition of the earth's crust in a given area.
Claim 2
Dependent Claim
129 words
A deformograph comprising a polarized light source designed to produce a light signal; a sensitive element shaped as a tube made of an optically sensitive material and fixed in a borehole by cementing the gap between said tube and walls of said borehole, one of ends of said sensitive element being tapered off and provided with a specular coating, while the other end facing said light source has a specular coating with transparent sections enabling passage of a light beam through the material of said sensitive element and its output after being reflected from the specular coating on the tapered end; a sensing unit designed to pick off from said sensitive element a useful light signal indicative of the changing condition of the earth's crust in a given area.
Claim 3
Dependent Claim
40 words
A deformograph as claimed in claim 1, wherein the tapered surface has transparent sections enabling output of a light beam to a sensing unit, said light beam coming from a light source disposed on the side of the opposite end.
Claim 4
Dependent Claim
14 words
A deformograph as claimed in claim 1, wherein the transparent sections represent concentric rings.
Claim 5
Dependent Claim
30 words
A deformograph as claimed in claim 1, wherein the sensitive element has a length providing deformation sensitivity of 10 -8 to 10 -10 in detecting deformation of the earth's crust.
Claim 6
Dependent Claim
14 words
A deformograph as claimed in claim 2, wherein the transparent sections represent concentric rings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |