US3408429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for centrifugal casting a contact lens
Assignee: Czech Academy of Sciences
•
Filing: 1965-01-04
•
Granted: 1968-10-29
•
Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Wichterle Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:20
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/04; B29C41/042; B29C41/045; B29C41/34; B29C41/38; B29C41/383; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00057; B29D11/00115; B29D11/00471; B29L; B29L2011/00; B29L2011/0016; B29L2011/0041; B29L2031/00; B29L2031/76; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2443390A
Cited
US2671932A
Cited
US3118198A
Cited
US3010153A
Cited
US3132017A
Cited
US3155479A
Cited
GB990207A
Cited
US3274301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |