US2656715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ocular tension indicator
Assignee: Individual
•
Filing: 1951-03-22
•
Granted: 1953-10-27
•
Expires: 1971-03-22
Abstract
No abstract record available.
Inventors
- 👤 Charles P Tolman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:13
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1419134A
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US1678681A
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US1743461A
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US2039231A
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US2421449A
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US2366645A
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US2400371A
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US2520223A
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US2553755A
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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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |