US4030812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lyotropic birefringent films
Assignee: 3M Co
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Filing: 1976-04-16
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Granted: 1977-06-21
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Expires: 1996-04-16
Abstract
Abstract Cyanuric halide is successively reacted with two moles of carboxy substituted aromatic amine and one mole of quaternizing agent such as pyridine and dissolved, e.g., in dilute ammonium hydroxide. At certain concentrations as the solution evaporates, it becomes nematic. The solution is evaporated on an oriented substrate so that the residue is anisotropic and is finally frozen in a resinous form which shows birefringence. The substrate and coating is valuable as a fractional wave plate.
Inventors
- 👤 Elwood L. Strebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3016; C; C09; C09K; C09K2323/00; C09K2323/03; C09K2323/031
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
As an article of manufacture, a retarder for plane-polarized light beams consisting essentially of the transparent combination of essentially isotropic substrate and coating thereon comprising substantially colorless vitreous anisotropic birefringent residue of lyotropic nematic mesomorph.
Claim 2
Dependent Claim
35 words
As an article of manufacture, a retarder for plane-polarized light beams consisting essentially of the transparent combination of essentially isotropic substrate and coating thereon comprising substantially colorless vitreous anisotropic birefringent residue of lyotropic nematic mesomorph.
Claim 3
Dependent Claim
10 words
The article of claim 1 wherein the substrate is glass.
Claim 4
Dependent Claim
19 words
The article of claim 1 wherein the lyotropic mesomorph comprises 1,3-bis(carboxy-substituted aromatic amino)triazinyl 5-pyridinium hydroxide complex or salt thereof.
Claim 5
Dependent Claim
17 words
The article of claim 1 wherein the lyotropic mesomorph comprises 1,3-bis(carboxyphenylamino)triazinyl 5-pyridinium hydroxide or ammonium salt thereof.
Claim 6
Dependent Claim
45 words
As an article of manufacture, a non-planar polarizer consisting essentially of plane-polarizing means in combination with a retarder for plane-polarized light consisting essentially of the transparent combination of essentially isotropic substrate and coating thereon comprising substantially colorless vitreous anisotropic birefringent residue of lyotropic nematic mesomorph.
Claim 7
Dependent Claim
45 words
As an article of manufacture, a non-planar polarizer consisting essentially of plane-polarizing means in combination with a retarder for plane-polarized light consisting essentially of the transparent combination of essentially isotropic substrate and coating thereon comprising substantially colorless vitreous anisotropic birefringent residue of lyotropic nematic mesomorph.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |