Patent US2893288A successfully refreshed from Google Patents.
US2893288A
Expired / Lapsed
US
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Portable eye-testing apparatus
Assignee: Individual
•
Filing: 1955-07-01
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Granted: 1959-07-07
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Expires: 1975-07-01
Abstract
No abstract record available.
Inventors
- 👤 John W Sheridan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:35
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/032
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US777867A
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US1201657A
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US1543188A
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US2091173A
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US2481582A
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US2485272A
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US2635502A
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US2573546A
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US2798408A
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US2795993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |