US2466958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable vision test chart illuminator
Assignee: Welch Allyn Inc
•
Filing: 1945-08-21
•
Granted: 1949-04-12
•
Expires: 1965-08-21
Abstract
No abstract record available.
Inventors
- 👤 Walter K Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:14
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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US960596A
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US1412632A
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US1647195A
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US1692999A
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US1874986A
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US1930081A
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US2014266A
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US1918047A
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US2185149A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-11 | 1952-10-11 | 1953-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-11 | 1956-10-11 | 1957-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-11 | 1960-10-11 | 1961-04-12 | $7700.00 | Window Closed / Lapsed |