US2806561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable structural assembly and interlocking units for constructing the same
Assignee: Individual
•
Filing: 1953-04-03
•
Granted: 1957-09-17
•
Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
- 👤 William B Spangler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
E; E01; E01C; E01C9/00; E01C9/08; E01C9/083
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1274353A
Cited
US1967620A
Cited
US2180317A
Cited
US2478993A
Cited
US2589304A
Cited
US2534501A
Cited
GB643921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |