US2291173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple picture projection slide
Assignee: Individual
•
Filing: 1941-08-05
•
Granted: 1942-07-28
•
Expires: 1961-08-05
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:23
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/14; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/8803; G03C9/00
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) | 1945-07-27 | 1946-01-26 | 1946-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-27 | 1950-01-26 | 1950-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-27 | 1954-01-26 | 1954-07-28 | $7700.00 | Window Closed / Lapsed |