Patent US2561403A successfully refreshed from Google Patents.
US2561403A
Expired / Lapsed
US
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Ophthalmic mounting
Assignee: E F NELSON Co Inc
•
Filing: 1947-01-24
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Granted: 1951-07-24
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Expires: 1967-01-24
Abstract
No abstract record available.
Inventors
- 👤 Ellis F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:30
CPC Classifications
G; G02; G02C; G02C5/00; G02C5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US585119A
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GB189406127A
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US1923566A
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US2023469A
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US2026087A
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US2032843A
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US2216503A
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US2162678A
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US2259080A
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US2259081A
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US2259082A
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US2436101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |