Patent US1806384A successfully refreshed from Google Patents.
US1806384A
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US
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Shadowless lighting apparatus
Assignee: Anciens Etablissements Barbier Benard and Turenne SA
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Filing: 1928-04-19
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Granted: 1931-05-19
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Expires: 1948-04-19
Abstract
No abstract record available.
Inventors
- 👤 Benard Henri Luglien Ma Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:02
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/0091; F21W; F21W2131/00; F21W2131/20; F21W2131/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-05-18 | 1934-11-17 | 1935-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-05-18 | 1938-11-17 | 1939-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-05-18 | 1942-11-17 | 1943-05-19 | $7700.00 | Window Closed / Lapsed |