Patent US2884702A successfully refreshed from Google Patents.
US2884702A
Expired / Lapsed
US
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Optometrical device
Assignee: Individual
•
Filing: 1954-09-09
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Granted: 1959-05-05
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Expires: 1974-09-09
Abstract
No abstract record available.
Inventors
- 👤 Engelmann Otto Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:34
CPC Classifications
G; G02; G02C; G02C13/00; G02C13/003; G02C13/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1130634A
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US1263713A
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US1557322A
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US1596810A
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US1981439A
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US2441453A
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GB632908A
Cited
US2596264A
Cited
US2574749A
Cited
US2545673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |