US2433674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact microscope
Assignee: Individual
•
Filing: 1945-09-25
•
Granted: 1947-12-30
•
Expires: 1965-09-25
Abstract
No abstract record available.
Inventors
- 👤 Daniel J O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:00
CPC Classifications
G; G02; G02B; G02B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US883868A
Cited
FR601154A
Cited
US1649303A
Cited
GB414324A
Cited
US2135870A
Cited
US2146506A
Cited
US2214367A
Cited
US2360268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |