Patent US3442571A successfully refreshed from Google Patents.
US3442571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prismatic member for differentially changing directions of light beams incident thereon
Assignee: Unisys Corp
•
Filing: 1966-02-08
•
Granted: 1969-05-06
•
Expires: 1986-02-08
Abstract
No abstract record available.
Inventors
- 👤 Irving Itzkan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:05
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3083; G02B27/00; G02B27/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
AN OPTICAL DEVICE FOR DIFFERENTIALLY CHANGING THE DIRECTIONS OF PROPAGATION OF ORTHOGONAL PLANE POLARIZED LIGHT BEAMS COMPRISING, A TRANSPARENT PRISMATIC MEMBER THAT EXHIBITS BIREFRINGENT EFFECTS TO ORTHOGONAL PLANE POLARIZED LIGHT BEAMS, SAID MEMBER HAVING A BASE SURFACE AND FIRST AND SECOND OPPOSITELY INCLINED SIDE SURFACES THAT JOIN SAID BASE SURFACE TO FORM RESPECTIVE ACUTE CORNER ANGLES OF SAID PRISMATIC MEMBER,
Claim 2
Dependent Claim
60 words
AN OPTICAL DEVICE FOR DIFFERENTIALLY CHANGING THE DIRECTIONS OF PROPAGATION OF ORTHOGONAL PLANE POLARIZED LIGHT BEAMS COMPRISING, A TRANSPARENT PRISMATIC MEMBER THAT EXHIBITS BIREFRINGENT EFFECTS TO ORTHOGONAL PLANE POLARIZED LIGHT BEAMS, SAID MEMBER HAVING A BASE SURFACE AND FIRST AND SECOND OPPOSITELY INCLINED SIDE SURFACES THAT JOIN SAID BASE SURFACE TO FORM RESPECTIVE ACUTE CORNER ANGLES OF SAID PRISMATIC MEMBER,
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) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |