Patent US3592564A successfully refreshed from Google Patents.
US2391344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal inspection device
Assignee: STC PLC
•
Filing: 1943-08-18
•
Granted: 1945-12-18
•
Expires: 1963-08-18
Abstract
No abstract record available.
Inventors
- 👤 James R Prall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:20
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/8803
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1948-12-17 | 1949-06-18 | 1949-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-17 | 1953-06-18 | 1953-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-17 | 1957-06-18 | 1957-12-18 | $7700.00 | Window Closed / Lapsed |