FR1581853A - - Google Patents
Info
- Publication number
- FR1581853A FR1581853A FR1581853DA FR1581853A FR 1581853 A FR1581853 A FR 1581853A FR 1581853D A FR1581853D A FR 1581853DA FR 1581853 A FR1581853 A FR 1581853A
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4130167 | 1967-09-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR1581853A true FR1581853A (enExample) | 1969-09-19 |
Family
ID=10419055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR1581853D Expired FR1581853A (enExample) | 1967-09-11 | 1968-09-11 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1581853A (enExample) |
| GB (1) | GB1231402A (enExample) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4070105A (en) * | 1976-03-05 | 1978-01-24 | Marzouk Youssef Marzouk | Laminar fresnel reduced ophthalmic lens construction |
| US4146306A (en) * | 1977-06-27 | 1979-03-27 | Wallach David L | Optical lens |
-
1967
- 1967-09-11 GB GB1231402D patent/GB1231402A/en not_active Expired
-
1968
- 1968-09-11 FR FR1581853D patent/FR1581853A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1231402A (enExample) | 1971-05-12 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |