US2255630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope
Assignee: IOWA STATE COLLEGE RES FOUND
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Filing: 1940-06-18
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Granted: 1941-09-09
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Expires: 1960-06-18
Abstract
No abstract record available.
Inventors
- 👤 John E Sass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:49
CPC Classifications
F; F16; F16M; F16M11/00; F16M11/02; F16M11/04; F16M11/043; F16M11/046; F16M11/20; F16M11/2007; F16M11/2014; F16M11/2092; F16M11/24; G; G02; G02B; G02B7/00; F16M2200/00; F16M2200/02; F16M2200/021; F16M2200/022; F16M2200/025; F16M2200/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-09-08 | 1945-03-10 | 1945-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-08 | 1949-03-10 | 1949-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-08 | 1953-03-10 | 1953-09-09 | $7700.00 | Window Closed / Lapsed |