US2831481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device
Assignee: Individual
•
Filing: 1950-08-26
•
Granted: 1958-04-22
•
Expires: 1970-08-26
Abstract
No abstract record available.
Inventors
- 👤 Alexander J Radin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:54
CPC Classifications
A; A61; A61B; A61B3/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1221091A
Cited
US1455011A
Cited
US1543188A
Cited
FR572086A
Cited
US2024194A
Cited
GB439979A
Cited
US2057983A
Cited
US2089863A
Cited
US2106918A
Cited
US2132670A
Cited
US2152050A
Cited
US2205965A
Cited
US2316139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |