Patent US3674040A successfully refreshed from Google Patents.
Patent EP0093005A2 successfully refreshed from Google Patents.
Patent US701686A successfully refreshed from Google Patents.
Patent US3989352A successfully refreshed from Google Patents.
US3989352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bismuth substituted rare earth garnets as magneto-optic materials exhibiting magnetic circular dichroism
Assignee: US Philips Corp
•
Filing: 1974-04-24
•
Granted: 1976-11-02
•
Expires: 1994-04-24
Abstract
Abstract A magneto-optic device employing-optic rotation element having a large magnetic circular dichroism (MCD) and consisting of a bismuth-substituted garnet of the composition: R.sub.3-x Bi.sub.x Fe.sub.5-y A.sub.y O.sub.12 where R is υ, Nd, Sm, Eu, Gd; 0.2 < x < 2.0; A is Ga or Al and O < y < 1.5; or, A is In or Sc and O < y < 0.8.
Inventors
- 👤 David Edward Lacklison
- 👤 John Lincoln Page
- 👤 Hugh Ivor Ralph
- 👤 George Blair Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:53
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0036; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/342; H01F1/344; H01F1/346; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24; H01F10/245
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
In a magneto-optic device having a transparent magneto-optic element capable of altering its transmission properties to light having a circularly polarized component at room temperature and where the material of the element exhibits the intrinsic property of magnetic circular dichroism, means to convey through the element a circularly polarized light beam, and means to detect intensity variations of the circularly polarized light beam caused by differences in the magnetization state of the element, the improvement wherein said element consists of a magnetic garnet material having the composition R 3-x Bi x Fe 5-y A y O 12 , where R = Y, Nd, Sm, Eu, Gd; 0.2 < x < 2.0 and for A = Ga, Al, 0 ≦ y ≦ 1.5, and for A = In, Sc, 0 ≦ y < 0.8.
Claim 2
Dependent Claim
133 words
In a magneto-optic device having a transparent magneto-optic element capable of altering its transmission properties to light having a circularly polarized component at room temperature and where the material of the element exhibits the intrinsic property of magnetic circular dichroism, means to convey through the element a circularly polarized light beam, and means to detect intensity variations of the circularly polarized light beam caused by differences in the magnetization state of the element, the improvement wherein said element consists of a magnetic garnet material having the composition R 3-x Bi x Fe 5-y A y O 12 , where R = Y, Nd, Sm, Eu, Gd; 0.2 < x < 2.0 and for A = Ga, Al, 0 ≦ y ≦ 1.5, and for A = In, Sc, 0 ≦ y < 0.8.
Claim 3
Dependent Claim
18 words
A device as claimed in claim 1, wherein R is Y, x = 0.264 and y = 0.
Claim 4
Dependent Claim
18 words
A device as claimed in claim 1, wherein R is Y, x = 0.71 and y = 0.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |