Patent US2529549A successfully refreshed from Google Patents.
US2529549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning cement surfaces preparatory to painting
Assignee: Individual
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Filing: 1947-06-30
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Granted: 1950-11-14
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Expires: 1967-06-30
Abstract
No abstract record available.
Inventors
- 👤 Irving A Halpern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:21
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/53; C04B41/5315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE METHOD OF CLEANING CEMENT AND CONCRETE SURFACES PREPARATORY TO PAINTING, CONSISTING ESSENTIALLY OF THE STEPS OF SPREADING OVER THE SURFACE TO BE CLEANED AN AQUEOUS SOLUTION CONTAINING FROM FIVE TO EIGHTY PARTS BY VOLUME OF PHOSPHORIC ACID (75%), TWENTY TO NINETY-FIVE PARTS BY VOLUME OF A SOLUTION IN WATER OF AN ALCOHOL VOLATILE AT ROOM TEMPERATURE, SAID WATER AND ALCOHOL BEING IN PROPORTIONS BY VOLUME OF ONE TO ONEAND-ONE-HALF OF WATER TO ONE VOLUME OF ALCOHOL AND AN EFFECTIVE AMOUNT OF WETTING AGENT FOR CEMENT SURFACES UNDER STRONG ACID CONDITIONS; BRUSH-SCRUBBING THE SURFACE; ADDING A LIMITED AMOUNT OF WATER TO THE MIXTURE ON THE SURFACE; REPEATING THE BRUSH-SCRUBBING; SCRAPING OFF THE EXCESS MIXTURE; AND WASHING OFF THE SURFACE WITH A LARGE EXCESS OF WATER.
Claim 2
Independent Claim
125 words
THE METHOD OF CLEANING CEMENT AND CONCRETE SURFACES PREPARATORY TO PAINTING, CONSISTING ESSENTIALLY OF THE STEPS OF SPREADING OVER THE SURFACE TO BE CLEANED AN AQUEOUS SOLUTION CONTAINING FROM FIVE TO EIGHTY PARTS BY VOLUME OF PHOSPHORIC ACID (75%), TWENTY TO NINETY-FIVE PARTS BY VOLUME OF A SOLUTION IN WATER OF AN ALCOHOL VOLATILE AT ROOM TEMPERATURE, SAID WATER AND ALCOHOL BEING IN PROPORTIONS BY VOLUME OF ONE TO ONEAND-ONE-HALF OF WATER TO ONE VOLUME OF ALCOHOL AND AN EFFECTIVE AMOUNT OF WETTING AGENT FOR CEMENT SURFACES UNDER STRONG ACID CONDITIONS; BRUSH-SCRUBBING THE SURFACE; ADDING A LIMITED AMOUNT OF WATER TO THE MIXTURE ON THE SURFACE; REPEATING THE BRUSH-SCRUBBING; SCRAPING OFF THE EXCESS MIXTURE; AND WASHING OFF THE SURFACE WITH A LARGE EXCESS OF WATER.
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) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |