US2663218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for correlating observer reading arousal values
Assignee: HAROLD L FEIGENHOLTZ
•
Filing: 1949-11-18
•
Granted: 1953-12-22
•
Expires: 1969-11-18
Abstract
No abstract record available.
Inventors
- 👤 Emil L Ranseen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:19
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/16; A61B5/163; A61B3/00; A61B3/10; A61B3/113
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |