US2647394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining the specific gravity and water content of concrete aggregates
Assignee: Individual
•
Filing: 1950-02-04
•
Granted: 1953-08-04
•
Expires: 1970-02-04
Abstract
No abstract record available.
Inventors
- 👤 Louis H Schaeperklaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:43
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/38; G01N33/383; G01N9/00; G01N9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1749606A
Cited
US2067742A
Cited
US2090421A
Cited
GB515921A
Cited
US2287027A
Cited
US2280617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |