US3454257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete testing mold
Assignee: ROBERT C DUPUIS
•
Filing: 1966-08-25
•
Granted: 1969-07-08
•
Expires: 1986-08-25
Abstract
No abstract record available.
Inventors
- 👤 Robert C Dupuis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:38
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0094; Y; Y10; Y10S; Y10S249/00; Y10S249/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |