US2875497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing hollow structural clay building units
Assignee: Individual
•
Filing: 1956-01-13
•
Granted: 1959-03-03
•
Expires: 1976-01-13
Abstract
No abstract record available.
Inventors
- 👤 Vern A Barnhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:53
CPC Classifications
B; B28; B28B; B28B3/00; B28B3/20; B28B3/26; Y; Y10; Y10S; Y10S425/00; Y10S425/109
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1193663A
Cited
US663141A
Cited
US720535A
Cited
US1508773A
Cited
US1738665A
Cited
US1849431A
Cited
US1872522A
Cited
US1976858A
Cited
US2209643A
Cited
US2230309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |