US2874442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making concrete structural shapes
Assignee: CEMENSTONE CORP
•
Filing: 1955-06-13
•
Granted: 1959-02-24
•
Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Henderson Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:02
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/24; B28B7/241; B28B7/246; B28B7/02
Claims Analysis
Total Claims: 0
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US870045A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |