US3820872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retro reflector
Assignee: Alcatel Lucent SAS
•
Filing: 1972-12-27
•
Granted: 1974-06-28
•
Expires: 1992-12-27
Abstract
Abstract A retro-reflector optical device is formed by three prismatic blocks each having a first and second plane face, one constituting the plane reflecting surface and the other lying coplanar and fixed thereby to a plane base.
Inventors
- 👤 R Lenfant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:14
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/122
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
In a retro-reflector comprising an optical device having at least a concave reflecting surface constituted by three plane reflecting surfaces forming a trirectangular trihedron, the improvement wherein: said optical device comprises three juxtaposed prismatic blocks each comprising first and second oppositely directed plane faces, the first plane face for each block constituting one of said plane reflecting surfaces, the planes of the second plane faces being coplanar, a plane base, and means for fixing the second plane faces of said blocks on said plane base with said blocks contiguous.
Claim 2
Dependent Claim
89 words
In a retro-reflector comprising an optical device having at least a concave reflecting surface constituted by three plane reflecting surfaces forming a trirectangular trihedron, the improvement wherein: said optical device comprises three juxtaposed prismatic blocks each comprising first and second oppositely directed plane faces, the first plane face for each block constituting one of said plane reflecting surfaces, the planes of the second plane faces being coplanar, a plane base, and means for fixing the second plane faces of said blocks on said plane base with said blocks contiguous.
Claim 3
Dependent Claim
51 words
The retro-reflector according to claim 1, wherein: said means for fixing the said second plane faces of the said blocks on the said plane base are constituted by a film of hardening adhesive substance deposited between each of the said second plane faces of the said blocks and said plane base.
Claim 4
Dependent Claim
13 words
The retro-reflector according to claim 1, wherein: said blocks are constituted by glass.
Claim 5
Dependent Claim
13 words
The retro-reflector according to claim 2, wherein: said blocks are constituted by glass.
Claim 6
Dependent Claim
14 words
The retro-reflector according to claim 3, wherein: said plane base is constituted by glass.
Claim 7
Dependent Claim
14 words
The retro-reflector according to claim 4, wherein: said plane base is constituted by glass.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |