US2835161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optometrical apparatus
Assignee: CHARLES E JACK
•
Filing: 1954-04-30
•
Granted: 1958-05-20
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Expires: 1974-04-30
Abstract
No abstract record available.
Inventors
- 👤 Frank J Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:07
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/0285; A61B3/04; G; G02; G02C; G02C13/00; G02C13/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US997289A
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US1471996A
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US1585489A
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US1804691A
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US2103340A
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US2545673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |