US2984888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making hollow concrete blocks
Assignee: Individual
•
Filing: 1956-08-30
•
Granted: 1961-05-23
•
Expires: 1976-08-30
Abstract
No abstract record available.
Inventors
- 👤 Collens Percy Pius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:28
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/04; B28B1/045; B28B7/00; B28B7/16; B28B7/18; B28B7/183; B28B7/34
Claims Analysis
Total Claims: 0
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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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |