US2689366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open plate floor
Assignee: Individual
•
Filing: 1951-02-23
•
Granted: 1954-09-21
•
Expires: 1971-02-23
Abstract
No abstract record available.
Inventors
- 👤 Ernest M Wichert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:14
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/427
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1089613A
Cited
US1098243A
Cited
US1953657A
Cited
US2050935A
Cited
US2190214A
Cited
US2241512A
Cited
US2308943A
Cited
US2269522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |