US3497577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of production of plastic lenses with aspherical surfaces
Assignee: Czech Academy of Sciences
•
Filing: 1967-02-14
•
Granted: 1970-02-24
•
Expires: 1987-02-14
Abstract
No abstract record available.
Inventors
- 👤 Otto Wichterle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:28
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00019; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2252504A
Cited
US2305945A
Cited
US2319014A
Cited
US3038210A
Cited
US3000057A
Cited
US3171869A
Cited
US3079736A
Cited
US3064401A
Cited
US3079737A
Cited
US3361858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |