US1415324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of rendering concrete resistant to waters charged with soluble compounds andproduct thereof
Assignee: Individual
•
Filing: 1920-09-30
•
Granted: 1922-05-09
•
Expires: 1940-09-30
Abstract
No abstract record available.
Inventors
- 👤 Bernard F Erdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:24
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B28/00; C04B28/02; C04B2103/00; C04B2103/60; C04B2103/606
Claims Analysis
Total Claims: 0
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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) | 1925-05-08 | 1925-11-07 | 1926-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-05-08 | 1929-11-07 | 1930-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-05-08 | 1933-11-07 | 1934-05-09 | $7700.00 | Window Closed / Lapsed |