Patent US2420316A successfully refreshed from Google Patents.
US2420316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perspective projector and enlarges
Assignee: —
•
Filing: —
•
Granted: 1947-05-13
•
Expires: 1964-05-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:10
CPC Classifications
G; G09; G09B; G09B11/00; G09B11/04; Y; Y10; Y10S; Y10S101/00; Y10S101/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US544642A
Cited
US561797A
Cited
US720820A
Cited
US1109864A
Cited
US1228685A
Cited
US1980556A
Cited
US2072286A
Cited
US2094543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |