US3094425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement grinding aid and pack set inhibitor
Assignee: WR Grace and Co
•
Filing: 1961-02-02
•
Granted: 1963-06-18
•
Expires: 1981-02-02
Abstract
No abstract record available.
Inventors
- 👤 Alfred B Adams
- 👤 Farkas Emery
- 👤 Francis J Mardulier
- 👤 Dunbar L Shanklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:19
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
AS A PORTLAND CEMENT ADDITIVE, 1 TO 20 PARTS OF A LIGNIN SULPHONATE ADMIXED WITH 1 PART BY WEIGHT OF CALCIUM ACETATE.
Claim 2
Dependent Claim
22 words
AS A PORTLAND CEMENT ADDITIVE, 1 TO 20 PARTS OF A LIGNIN SULPHONATE ADMIXED WITH 1 PART BY WEIGHT OF CALCIUM ACETATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |