US2153741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making reinforced hollow slabs
Assignee: Individual
•
Filing: 1936-12-14
•
Granted: 1939-04-11
•
Expires: 1956-12-14
Abstract
No abstract record available.
Inventors
- 👤 Walter H Cobi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/04; B28B7/00; B28B7/28; B28B7/30; Y; Y10; Y10S; Y10S425/00; Y10S425/014
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) | 1942-04-10 | 1942-10-10 | 1943-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-10 | 1946-10-10 | 1947-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-10 | 1950-10-10 | 1951-04-11 | $7700.00 | Window Closed / Lapsed |