Patent US3424518A successfully refreshed from Google Patents.
US3424518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for projecting and observing images of external objects upon the retina of the eye
Assignee: Nikon Corp
•
Filing: 1964-10-29
•
Granted: 1969-01-28
•
Expires: 1984-10-29
Abstract
No abstract record available.
Inventors
- 👤 Tikasi Sato
- 👤 Tai Sato
- 👤 Tutomu Sato
- 👤 Kenzo Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:30
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14; A61B3/13; A61B3/132
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |