Patent US3215548A successfully refreshed from Google Patents.
US3215548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additives for concrete, mortar and grout
Assignee: Sika Corp
•
Filing: 1961-12-14
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Granted: 1965-11-02
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Expires: 1981-12-14
Abstract
No abstract record available.
Inventors
- 👤 Charles A Vollick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:56
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
A CEMENT COMPOSITION CONSISTING PREDOMINATELY OF AN HYDRAULIC CEMENT SELECTED FROM THE GROUP CONSISTING OF PORTLAND CEMENT, BLENDS OF PORTLAND CEMENT AND NATURAL CEMENT, AIR-ENTRAINING PORTLAND CEMENT, PORTLANDPOZZOLAN CEMENT, SLAG CEMENT, AND A MIXTURE OF PORTLAND CEMENT AND BLAST-FURNACE CEMENT, AND CONTAINING A SMALL PERCENTAGE WITHIN THE RANGE FROM ABOUT 0.25% TO ABOUT 1% OF (1) A COMPOUND OF THE GROUP CONSISTING OF THE LIGNINS, AND A SMALL PROPORTION, WITHIN THE RANGE FROM ABOUT 0.005% TO ABOUT 1% OF (2) A COMPOUND OF THE GROUP CONSISTING OF SULPHONATED NAPHTHALENE AND THE SALTS OF SULPHONATED NAPHTHALENE, EACH BASED ON THE WEIGHT OF THE CONTENT.
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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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |