US2820568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall structure
Assignee: Chicago Bridge and Iron Co
•
Filing: 1954-10-14
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Granted: 1958-01-21
•
Expires: 1974-10-14
Abstract
No abstract record available.
Inventors
- 👤 Leonard P Zick
- 👤 Harry C Boardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/04; E02B3/06; B; B65; B65D; B65D90/00; B65D90/02; B65D90/023; B65D90/026
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |