US2837963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical apparatus for the examination of the human eye
Assignee: ALLIED INSTR MANUFACTURERS Ltd
•
Filing: 1950-01-23
•
Granted: 1958-06-10
•
Expires: 1970-01-23
Abstract
No abstract record available.
Inventors
- 👤 Binstead Hugh Cecil
- 👤 Stockwell Henry James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:00
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/0075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1671152A
Cited
GB282187A
Cited
GB423175A
Cited
DE620541C
Cited
DE640084C
Cited
US2204014A
Cited
US2257331A
Cited
US2235319A
Cited
CH235602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |