Patent US2977221A successfully refreshed from Google Patents.
US2255367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall structure
Assignee: Individual
•
Filing: 1939-12-15
•
Granted: 1941-09-09
•
Expires: 1959-12-15
Abstract
No abstract record available.
Inventors
- 👤 Schenk Eduard
- 👤 Christian J Herzog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:03
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B2/00; E04B2/74; E04B2/7407; E04B2/7453; E04B2/7457; E04B2/72; E04B2/723; E04B2/7409; E04B2/7411; E04B2001/742; E04B2001/747; E04B1/82; E04B1/84; E04B2001/8457; E04B2001/8461; E04B2001/8471; E04B2001/8476; E04B2001/848; E04B2001/8485; E04B2002/7461; E04B2002/7468
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-09-08 | 1945-03-10 | 1945-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-08 | 1949-03-10 | 1949-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-08 | 1953-03-10 | 1953-09-09 | $7700.00 | Window Closed / Lapsed |