US2510001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable light shield for trouble lamp guards
Assignee: RICHARD A VAN DUZER
•
Filing: 1948-04-19
•
Granted: 1950-05-30
•
Expires: 1968-04-19
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Van Duzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:09
CPC Classifications
F; F21; F21L; F21L14/00; F21L14/02; F21V; F21V14/00; F21V14/04; F21V14/045; F21V14/08; F21V14/085; F21V15/00; F21V15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1606219A
Cited
US1692892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |