Patent US4460987A successfully refreshed from Google Patents.
Patent US1887708A successfully refreshed from Google Patents.
US1887708A
Expired / Lapsed
US
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Instrument and method for examining, testing and exercising the eyes
Assignee: Individual
•
Filing: 1928-01-18
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Granted: 1932-11-15
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Expires: 1948-01-18
Abstract
No abstract record available.
Inventors
- 👤 Alexander S Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:20
CPC Classifications
A; A61; A61B; A61B3/00; A61H; A61H5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-11-15 | 1936-05-16 | 1936-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-15 | 1940-05-16 | 1940-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-15 | 1944-05-16 | 1944-11-15 | $7700.00 | Window Closed / Lapsed |