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US3773684A
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Dipolar electro-optic compositions and method of preparation
Assignee: Individual
•
Filing: 1970-03-03
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Granted: 1973-11-20
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Expires: 1990-03-03
Abstract
Abstract Methods and apparatus incorporating suspensions of assymetric minute dipolar particles for the control of electromagnetic radiation. The physical electrical and optical properties of the dipolar particles and their suspending medium are specified in conjunction with apparatus employing them.
Inventors
- 👤 A Marks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/172
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
20 words
An electrodichroic composition of matter according to claim 1 in which the transparent fluid suspending medium is a thermoplastic medium.
Claim 2
Dependent Claim
18 words
An electrodichroic composition of matter according to claim 1 in which the transparent fluid suspending medium is thixotropic.
Claim 3
Dependent Claim
24 words
An electrodichroic composition of matter according to claim 1 in which the transparent fluid suspending medium has a resistivity of at least 30 megohm-cm.
Claim 4
Dependent Claim
40 words
An electrodichroic composition of matter according to claim 1, in which the conductive particles are selected from the class consisting of aluminum, aluminum nickelide, antimony, cadmium, chromium, copper, gold, indium, lead, palladium, platinum, silver tantalum, thalium, titanium herapathite and tungsten.
Claim 5
Dependent Claim
15 words
An electrodichroic composition of matter according to claim 1 in which the particles are needle-like.
Claim 6
Dependent Claim
27 words
A pigment comprising an electrodichroic composition of matter according to claim 6, in which the dipoles have maximum lengths in the rnage of 1000 to 3000 A.
Claim 7
Dependent Claim
56 words
An electrodichroic composition of matter according to claim 1 in which the particls have a long dimension of the order of lambda /2n, and at least one other dimension not exceeding lambda /10n, where lambda is the wavelength of light in the visual range and n is the indeX of refraction of said transprent suspending medium.
Claim 8
Dependent Claim
33 words
An electrodichroic composition according to claim 5 in which the particles are flakes having long dimensions in the range of 1000 to 10,000 A, and said flakes having thicknesses of 50 to 250A.
Claim 9
Dependent Claim
52 words
The method of preparing a dipolar crystalline suspension defined by claim 1 which comprises forming from solution a suspension of needle-like crystals in a solvent media, saod solution being in at least a saturated condition, adding a miscible non-solvent of higher boiling point to said solution, and thereafter removing the solvent component.
Claim 10
Dependent Claim
55 words
The method of preparing a dipolar crystalline suspension defined by claim 1 which comprises forming from solution a suspension of needle-like crystals in a solvent media containing a polymer, said solution being in at least a saturated condition, adding a miscible non-solvent of higher boiling point to said solution and thereafter removing the solvent component.
Claim 11
Dependent Claim
71 words
The method of preparing a dipolar crystalline suspension defined by claim 1 which comprises forming from solution a suspension of needle-like crystals in a solvent media containing a polymer, said solution being in at least a saturated condition, adding a miscible non-solvent of higher boiling point to said solution and thereafter removing the solvent component, said non-solvent being of a sufficient quantity to form a paste upon removal of the solvent.
Claim 12
Dependent Claim
92 words
The method of preparing a dipolar crystalline suspension defined by claim 1 which comprises forming from solution a suspension of needle-like crystals from a solvent media containing a polymer, said solution being in at least a saturated condition, adding a miscible non-solvent of higher boiling point to said solution and thereafter removing the solvent component by vacuum, said non-solvent being of a sufficient quantity to form a paste upon removal of the solvent, and thereafter adding a low viscosity miscible non-solvent to dilute the paste to form a low viscosity dipolar suspension.
Claim 13
Dependent Claim
14 words
A method according to claim 13 in which the needle-like crystals are Herapathite crystals.
Claim 14
Dependent Claim
37 words
An electrodichroic composition of matter of a high viscosity concentrate including a polymer 1000 parts, plasticizer 1000-5000 parts, dipolar particles 1-1000 parts suspended therein, and said dipolar particles having lengths in the range of 0.1-1 Mu .
Claim 15
Dependent Claim
41 words
An electrodichroic composition of matter including a nonionic fluid containing 1-10 percent of a high viscosity concentrate according to claim 15, with which the polymer and plasticizer is compatible, and dissolved therein, and in which total composition the dipoles are suspended.
Claim 16
Dependent Claim
42 words
An electrodichroic composition of matter comprising a suspension of conductive particles in a non-reactive transparent fluid suspending medium, said particles having lengths in the range of 0.1-0.2 Mu and each of said particles having length to thickness ratios of at least 5.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |