Patent US3025755A successfully refreshed from Google Patents.
US3025755A
Expired / Lapsed
US
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Visual field examination device
Assignee: ROBERTS INSTR Co
•
Filing: 1958-09-22
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Granted: 1962-03-20
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Expires: 1978-09-22
Abstract
No abstract record available.
Inventors
- 👤 Robert A Koetting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:55
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1780291A
Cited
US1920428A
Cited
US2376554A
Cited
US2564794A
Cited
GB694128A
Cited
US2718227A
Cited
US2835162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-19 | 1965-09-18 | 1966-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-19 | 1969-09-18 | 1970-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-19 | 1973-09-18 | 1974-03-20 | $7700.00 | Window Closed / Lapsed |