Patent US2293431A successfully refreshed from Google Patents.
US2293431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separable structure
Assignee: Individual
•
Filing: 1939-06-30
•
Granted: 1942-08-18
•
Expires: 1959-06-30
Abstract
No abstract record available.
Inventors
- 👤 Hurxthal F Frease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:06
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/343; E04B1/34315; E04B2/00; E04B2/56; E04B5/00; E04B5/02; E04B5/12
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) | 1945-08-17 | 1946-02-16 | 1946-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-08-17 | 1950-02-16 | 1950-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-08-17 | 1954-02-16 | 1954-08-18 | $7700.00 | Window Closed / Lapsed |