US2546054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical projecting apparatus for a disk with concentric tracks of matter to be projected
Assignee: BRITISH VIBRALUX Ltd
•
Filing: 1947-11-04
•
Granted: 1951-03-20
•
Expires: 1967-11-04
Abstract
No abstract record available.
Inventors
- 👤 Aldrich William Stanley
- 👤 Aldrich Edward Charlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:45
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B23/00; G03B23/08; G03B23/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1698013A
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US1788808A
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US1761360A
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US1992776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |