US2589530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projector with rotatable picture drum and magnetic braking means
Assignee: REGINALD ERNEST COOPER
•
Filing: 1950-11-14
•
Granted: 1952-03-18
•
Expires: 1970-11-14
Abstract
No abstract record available.
Inventors
- 👤 Brightwell Doreen Winifred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:37
CPC Classifications
G; G09; G09F; G09F19/00; G09F19/12; G09F19/18; G03; G03B; G03B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1077690A
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US1386126A
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US1472222A
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US1450179A
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US1567471A
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US1698872A
Cited
US1610055A
Cited
GB501540A
Cited
US2501862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |