Patent US2425771A successfully refreshed from Google Patents.
US2425771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating roof for liquid storage tanks
Assignee: Individual
•
Filing: 1944-08-19
•
Granted: 1947-08-19
•
Expires: 1964-08-19
Abstract
No abstract record available.
Inventors
- 👤 John H Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:17
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1979272A
Cited
US1787546A
Cited
US2282772A
Cited
US2287213A
Cited
US2321058A
Cited
US2359416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |