US5223310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear sensitive monomer-polymer laminate structure and method of using same
Assignee: National Aeronautics and Space Administration
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Filing: 1992-03-02
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Granted: 1993-06-29
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Expires: 2012-03-02
Abstract
Abstract The laminate structure comprises a liquid crystal polymer substrate attached to a test surface of an article. A light absorbing coating is applied to the substrate and is thin enough to permit bonding steric interaction between the liquid crystal polymer substrate and an overlying liquid crystal monomer thin film. Light is directed through and reflected by the liquid crystal monomer thin film and unreflected light is absorbed by the underlying coating. The wavelength of the reflected light is indicative of the shear stress experienced by the test surface.
Inventors
- 👤 Jag J. Singh
- 👤 Abe Eftekhari
- 👤 Devendra S. Parmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:10
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/24; G01L1/247; G01N; G01N11/00; G01N11/02; C; C09; C09K; C09K2323/00; C09K2323/03; C09K2323/031; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A shear sensitive laminate structure for use in determining the shear stress of an article comprising: a liquid crystal polymer substrate located on the article; a light absorbing coating on an upper surface of said liquid crystal polymer substrate; a liquid crystal monomer thin film overlying said coating, wherein light directed into said liquid crystal monomer thin film is reflected thereby, wherein the wavelength of the reflected light is indicative of the shear stress experienced by the article; and wherein said light absorbing coating absorbs light unreflected by said liquid crystal monomer thin film; and wherein said coating is thin enough to permit steric interaction between said liquid crystal polymer substrate and said liquid crystal monomer thin film to maintain Grandjean texture, whereby said film is held in place.
Claim 2
Dependent Claim
129 words
A shear sensitive laminate structure for use in determining the shear stress of an article comprising: a liquid crystal polymer substrate located on the article; a light absorbing coating on an upper surface of said liquid crystal polymer substrate; a liquid crystal monomer thin film overlying said coating, wherein light directed into said liquid crystal monomer thin film is reflected thereby, wherein the wavelength of the reflected light is indicative of the shear stress experienced by the article; and wherein said light absorbing coating absorbs light unreflected by said liquid crystal monomer thin film; and wherein said coating is thin enough to permit steric interaction between said liquid crystal polymer substrate and said liquid crystal monomer thin film to maintain Grandjean texture, whereby said film is held in place.
Claim 3
Dependent Claim
18 words
The shear sensitive laminate structure according to claim 1, wherein said light absorbing coating comprises a lacquer paint.
Claim 4
Dependent Claim
16 words
The shear sensitive laminate structure according to claim 1, wherein said light absorbing coating is black.
Claim 5
Dependent Claim
20 words
The shear sensitive laminate structure according to claim 1, wherein said liquid crystal polymer substrate comprises a wholly aromatic polyester.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |