Patent US2529664A successfully refreshed from Google Patents.
US2529664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual educational projector
Assignee: WARD HICKOK
•
Filing: 1948-02-14
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Granted: 1950-11-14
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Expires: 1968-02-14
Abstract
No abstract record available.
Inventors
- 👤 Hudson B Roysher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:46
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1763630A
Cited
US1984004A
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US1919922A
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US2210333A
Cited
US2168137A
Cited
US2181134A
Cited
US2250174A
Cited
US2342115A
Cited
US2381260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |