Patent US2580164A successfully refreshed from Google Patents.
US2580164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic slide viewer
Assignee: Individual
•
Filing: 1950-01-31
•
Granted: 1951-12-25
•
Expires: 1970-01-31
Abstract
No abstract record available.
Inventors
- 👤 Charles F Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:39
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/022; G02B27/024; G02B27/025
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1957716A
Cited
US1796432A
Cited
US1989454A
Cited
US2071121A
Cited
US2403747A
Cited
GB600954A
Cited
US2461718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |