US3927930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light polarization employing magnetically oriented ferrite suspensions
Assignee: Polaroid Corp
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Filing: 1974-05-13
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Granted: 1975-12-23
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Expires: 1994-05-13
Abstract
Abstract Light polarization is provided by disposing finely divided ferrite particles in an inert light-transmitting medium on a transparent support to form a suspension of the particles in the medium, applying a magnetic field to the suspension to orient the particles into line patterns which polarize visible light transmitted through the suspension and detecting the polarized light by suitable means.
Inventors
- 👤 Paul Goldberg
- 👤 Heerden Pieter J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/172; G02F1/09; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
LIGHT POLARIZATION APPARATUS COMPRISING: A SOURCE OF VISIBLE LIGHT, A LIGHT POLARIZER EXPOSED TO SAID VISIBLE LIGHT AND COMPRISING FINELY DIVIDED FERRITE PARTICLE SUSPENDED IN AN INERT LIGHTTRANSMITTING MEDIUM ON A TRANSPARENT SUPPORT, SAID FERRITE PARTICLES BEING MAGNETICALLY ORIENTED IN SAID MEDIUM INTO LINE-SHAPED PATTERNS WHICH POLARIZE SAID VISIBLE LIGHT TRANSMITTED THROUGH SAID SUSPENSION, AND MEANS FOR DETECTING SAID TRANSMITTED POLARIZED LIGHT.
Claim 2
Dependent Claim
62 words
LIGHT POLARIZATION APPARATUS COMPRISING: A SOURCE OF VISIBLE LIGHT, A LIGHT POLARIZER EXPOSED TO SAID VISIBLE LIGHT AND COMPRISING FINELY DIVIDED FERRITE PARTICLE SUSPENDED IN AN INERT LIGHTTRANSMITTING MEDIUM ON A TRANSPARENT SUPPORT, SAID FERRITE PARTICLES BEING MAGNETICALLY ORIENTED IN SAID MEDIUM INTO LINE-SHAPED PATTERNS WHICH POLARIZE SAID VISIBLE LIGHT TRANSMITTED THROUGH SAID SUSPENSION, AND MEANS FOR DETECTING SAID TRANSMITTED POLARIZED LIGHT.
Claim 3
Dependent Claim
11 words
Apparatus as defined in claim 1 wherein said medium is liquid.
Claim 4
Dependent Claim
11 words
Apparatus as defined in claim 1 wherein said medium is water.
Claim 5
Dependent Claim
20 words
Apparatus as defined in claim 1 wherein the particle size of said ferrite particles is about 0.02 micron in diameter.
Claim 6
Dependent Claim
24 words
Apparatus as defined in claim 1 wherein the concentration of said ferrite particles in said suspension is about 0.02 to 0.50 gram per cc.
Claim 7
Independent Claim
77 words
A METHOD OF LIGHT POLARIZATION WHICH COMPRISES: EXPOSING TO A SOURCE OF VISIBLE LIGHT, A SUSPENSION OF FINELY DIVIDED FERRITE PARTICLES IN AN INERT LIQUID MEDIUM ON A TRANSPARENT SUPPORT; SUBJECTING SAID SUSPENSION TO A MAGNETIC FIELD TO ORIENT SAID PARTICLES IN SAID MEDIUM INTO LINE-SHAPED PATTERNS WHICH POLARIZE SAID VISIBLE LIGHT TRANSMITTED THROUGH SAID SUSPENSION TO FORM A LIGHT POLARIZER; AND DETECTING SAID TRANSMITTED POLARIZED LIGHT BY OBSERVING SAID LIGHT THROUGH CONVENTIONAL POLARIZED LIGHT DETECTION MEANS.
Claim 8
Independent Claim
77 words
A METHOD OF LIGHT POLARIZATION WHICH COMPRISES: EXPOSING TO A SOURCE OF VISIBLE LIGHT, A SUSPENSION OF FINELY DIVIDED FERRITE PARTICLES IN AN INERT LIQUID MEDIUM ON A TRANSPARENT SUPPORT; SUBJECTING SAID SUSPENSION TO A MAGNETIC FIELD TO ORIENT SAID PARTICLES IN SAID MEDIUM INTO LINE-SHAPED PATTERNS WHICH POLARIZE SAID VISIBLE LIGHT TRANSMITTED THROUGH SAID SUSPENSION TO FORM A LIGHT POLARIZER; AND DETECTING SAID TRANSMITTED POLARIZED LIGHT BY OBSERVING SAID LIGHT THROUGH CONVENTIONAL POLARIZED LIGHT DETECTION MEANS.
Claim 9
Dependent Claim
13 words
A method as defined in claim 6 wherein said liquid medium is water.
Claim 10
Dependent Claim
42 words
A method as defined in claim 6 wherein said liquid medium is set to a rigid form while under the influence of said magnetic field to form thereby a polarizer which retains its light polarizing properties when removed from said magnetic field.
Claim 11
Dependent Claim
15 words
A method as defined in claim 8 wherein said settable medium is a polymerizable monomer.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |