US2453223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making concrete building units
Assignee: CEMENSTONE CORP
•
Filing: 1946-10-01
•
Granted: 1948-11-09
•
Expires: 1966-10-01
Abstract
No abstract record available.
Inventors
- 👤 Henderson Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:01
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0002; B28B7/0011; B28B7/0064; B28B7/0085; B28B7/36; Y; Y10; Y10S; Y10S264/00; Y10S264/43; Y10S425/00; Y10S425/044
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2007063A
Cited
US1324027A
Cited
US248722A
Cited
US1708555A
Cited
US640653A
Cited
US681700A
Cited
US775588A
Cited
US916796A
Cited
US1525797A
Cited
US1554586A
Cited
US1684624A
Cited
US1744309A
Cited
US2040732A
Cited
US2220448A
Cited
US2310400A
Cited
US2294556A
Cited
US2363226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |