US3331695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spodumene accelerated portland cement
Assignee: WR Grace and Co
•
Filing: 1964-06-23
•
Granted: 1967-07-18
•
Expires: 1984-06-23
Abstract
No abstract record available.
Inventors
- 👤 Richard L Angstadt
- 👤 Forrest R Hurley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:20
CPC Classifications
C; C04; C04B; C04B22/00; C04B14/00; C04B14/02; C04B14/04; C04B14/045
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
23 words
A CEMENT COMPOSITION CONSISTING ESSENTIALLY OF PORTLAND CEMENT AND FROM ABOUT 0.1 TO 20% SPODUMENE BASED ON THE DRY WEIGHT OF THE CEMENT.
References Cited (Backward Citations)
US2806530A
Cited
US2815293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |