US2215900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catadioptrical lens
Assignee: Individual
•
Filing: 1939-10-28
•
Granted: 1940-09-24
•
Expires: 1959-10-28
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Bitner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:41
CPC Classifications
G; G02; G02B; G02B19/00; G02B19/0004; G02B19/0028; F; F21; F21V; F21V13/00; F21V13/02; F21V13/04; F21V5/00; F21V5/04; F21V7/00; F21V7/0091; G02B19/0033; G02B19/0047; F21W; F21W2107/00; F21W2107/10
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) | 1943-09-24 | 1944-03-25 | 1944-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-24 | 1948-03-25 | 1948-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-24 | 1952-03-25 | 1952-09-24 | $7700.00 | Window Closed / Lapsed |