US3423219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for grinding portland cement clinker
Assignee: SCM Corp
•
Filing: 1964-07-06
•
Granted: 1969-01-21
•
Expires: 1984-07-06
Abstract
No abstract record available.
Inventors
- 👤 James N Stone
- 👤 George H Eick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:41
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2225149A
Cited
US2370983A
Cited
GB572817A
Cited
GB590643A
Cited
US2483806A
Cited
US2510776A
Cited
US2521073A
Cited
GB727280A
Cited
US3208863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |