US2057524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall construction for tunnels, shafts, and pipe
Assignee: Individual
•
Filing: 1934-09-22
•
Granted: 1936-10-13
•
Expires: 1954-09-22
Abstract
No abstract record available.
Inventors
- 👤 Herzbruch Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:21
CPC Classifications
E; E21; E21D; E21D5/00; E21D5/04; E21D11/00; E21D11/14; E21D11/15; E21D5/06; E21D5/10
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) | 1939-10-13 | 1940-04-13 | 1940-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-10-13 | 1944-04-13 | 1944-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-10-13 | 1948-04-13 | 1948-10-13 | $7700.00 | Window Closed / Lapsed |