Patent US2925009A successfully refreshed from Google Patents.
US2925009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound slide film machine
Assignee: DU KANE CORP
•
Filing: 1957-03-07
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Granted: 1960-02-16
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Expires: 1977-03-07
Abstract
No abstract record available.
Inventors
- 👤 Robert H Larson
- 👤 Charles W Carlson
- 👤 Koenig Joost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:53
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1868722A
Cited
US2485575A
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US2485709A
Cited
US2525552A
Cited
US2651967A
Cited
US2666358A
Cited
US2762256A
Cited
US2763178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |