Patent US2677867A successfully refreshed from Google Patents.
US2677867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete form lining and impregnant therefor
Assignee: Individual
•
Filing: 1950-09-26
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Granted: 1954-05-11
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Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 Gonzalo Jose Maria Aguirre
- 👤 Chacon Jaime Castejon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:06
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/38; B28B7/384
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
AN AQUEOUS COMPOSITION SUITABLE FOR REDUCING THE ADHESION OF WOOD AND SIMILAR MATERIALS TO CONCRETE CONTAINING PER LITER 20 TO 60 G. OF A MIXTURE OF AMMONIUM CARBONATE, AMMONIUM SULFATE AND AMMONIUM CHLORIDE, 1-10 G. OF CRESOL AND PHENOL, AT LEAST 2 G. OF TAR, AND 0.5 TO 5 G. OF A MEMBER OF THE GROUP CONSISTING OF PYRIDINE AND PYRIMIDINE.
References Cited (Backward Citations)
US967982A
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US1004844A
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US1985092A
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US1988175A
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US2296553A
Cited
US2390408A
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US2439440A
Cited
US2411815A
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US2439411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |