US2800054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection device with directional lens
Assignee: Ambac International Corp
•
Filing: 1953-06-29
•
Granted: 1957-07-23
•
Expires: 1973-06-29
Abstract
No abstract record available.
Inventors
- 👤 Allison William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:20
CPC Classifications
G; G03; G03B; G03B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1806864A
Cited
GB191124917A
Cited
US1358685A
Cited
US1506729A
Cited
US1484287A
Cited
US1808725A
Cited
US1919561A
Cited
US2313947A
Cited
US2550350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |