US3472581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused multifocal corneal contact lenses
Assignee: Individual
•
Filing: 1966-09-26
•
Granted: 1969-10-14
•
Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Leonard Bronstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:38
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/048; G02C7/041; G02C7/042; G02C7/043; G02C7/044; G02C7/045; G02C7/049; G02C2202/00; G02C2202/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1396303A
Cited
US1554933A
Cited
US1734428A
Cited
GB580242A
Cited
FR1295294A
Cited
US3270099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |