US2473174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double exposure photographing and developing apparatus
Assignee: SPEEDTYPE Inc
•
Filing: 1944-12-04
•
Granted: 1949-06-14
•
Expires: 1964-12-04
Abstract
No abstract record available.
Inventors
- 👤 George N Pifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; G03B17/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2168974A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |