US2629283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference schlieren apparatus of unusually large dimensions, having means for improving the interference quality by selective one point deformation of the reflecting elements of the device
Assignee: Individual
•
Filing: 1951-03-13
•
Granted: 1953-02-24
•
Expires: 1971-03-13
Abstract
No abstract record available.
Inventors
- 👤 Theodor W Zobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:14
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/50; G02B27/54
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) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |