US2439792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating roof storage tank
Assignee: Chicago Bridge and Iron Co
•
Filing: 1945-12-29
•
Granted: 1948-04-20
•
Expires: 1965-12-29
Abstract
No abstract record available.
Inventors
- 👤 Harry C Boardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:17
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/78
Claims Analysis
Total Claims: 0
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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) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |