US2422378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-level reflector
Assignee: California Institute Research Foundation
•
Filing: 1943-11-22
•
Granted: 1947-06-17
•
Expires: 1963-11-22
Abstract
No abstract record available.
Inventors
- 👤 David F Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/04; F21V7/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE203669C
Cited
US270339A
Cited
FR429668A
Cited
US1189231A
Cited
US1515897A
Cited
US1894227A
Cited
GB398966A
Cited
US2266190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-16 | 1950-12-16 | 1951-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-16 | 1954-12-16 | 1955-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-16 | 1958-12-16 | 1959-06-17 | $7700.00 | Window Closed / Lapsed |