Patent US2768432A successfully refreshed from Google Patents.
US2768432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for erecting roofs of tanks
Assignee: Chicago Bridge and Iron Co
•
Filing: 1951-02-15
•
Granted: 1956-10-30
•
Expires: 1971-02-15
Abstract
No abstract record available.
Inventors
- 👤 Clarence W Hines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:46
CPC Classifications
E; E04; E04H; E04H7/00; E04H7/02; E04H7/04; E04H7/06; E04H7/065; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49828; Y10T29/49831; Y10T29/49895; Y10T29/49904
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1844961A
Cited
US1846294A
Cited
GB322099A
Cited
US1965736A
Cited
US1947515A
Cited
US2114513A
Cited
US2304354A
Cited
US2287197A
Cited
US2432528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |