Patent US4289541A successfully refreshed from Google Patents.
US4289541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of cleaning an austenitic steel surface
Assignee: Voestalpine AG
•
Filing: 1979-02-21
•
Granted: 1981-09-15
•
Expires: 1999-02-21
Abstract
Abstract An austenitic steel surface is cleaned of ferritic contaminations and other impurities by blasting it with a wet abrasive mixture containing 40-90% by volume, of corundum having an average grain size of 0.2 to 0.6 mm and of triangular faces. This wet abrasive mixture is accelerated and applied to the surface under a gas pressure of 2.5 to 5.5 atmospheres, 0.8 to 3 kg of corundum being applied per 100 cm 2 of the surface to be cleaned. Before the surface has dried, a rinsing liquid is applied thereto.
Inventors
- 👤 Felix Wallner
- 👤 Walter Lugscheider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:40
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C11/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A process of cleaning a surface of austenitic steel, which comprises the steps of (a) blasting the surface with an abrasive mixture consisting, by volume, of 40% to 90% of corundum and 60% to 10% of a liquid, the corundum having an average grain size of 0.2 to 0.6 mm and corundum grains having triangular faces, (1) the abrasive blasting mixture being accelerated and applied to the austenitic steel surface by a compressed gas under a pressure in the range of 2.5 to 5.5 atmospheres, the gas pressure increasing in direct proportion to the liquid content in the mixture, and (2) 0.8 to 3 kg of corundum being applied per 100 cm 2 of the austenitic steel surface to be cleaned, and (b) applying a rinsing liquid to the blasted surface before the surface has dried.
Claim 2
Dependent Claim
136 words
A process of cleaning a surface of austenitic steel, which comprises the steps of (a) blasting the surface with an abrasive mixture consisting, by volume, of 40% to 90% of corundum and 60% to 10% of a liquid, the corundum having an average grain size of 0.2 to 0.6 mm and corundum grains having triangular faces, (1) the abrasive blasting mixture being accelerated and applied to the austenitic steel surface by a compressed gas under a pressure in the range of 2.5 to 5.5 atmospheres, the gas pressure increasing in direct proportion to the liquid content in the mixture, and (2) 0.8 to 3 kg of corundum being applied per 100 cm 2 of the austenitic steel surface to be cleaned, and (b) applying a rinsing liquid to the blasted surface before the surface has dried.
Claim 3
Dependent Claim
19 words
The cleaning process of claim 1, wherein the abrasive blasting mixture contains 50% to 60%, by volume, of corundum.
Claim 4
Dependent Claim
14 words
The cleaning process of claim 2, wherein the gas pressure is about 4.2 atmospheres.
Claim 5
Dependent Claim
36 words
The cleaning process of claim 1, wherein the average grain size of the corundum is about 0.4 mm and about 2 kg of corundum is applied per 100 cm 2 of the surface to be cleaned.
Claim 6
Dependent Claim
25 words
The cleaning process of claim 1, wherein 1 to 10 liters of the rinsing liquid is applied per 100 cm 2 of the blasted surface.
Claim 7
Dependent Claim
29 words
The cleaning process of claim 1, wherein the austenitic steel surface contains ferritic contaminations and the contaminations are removed by blasting the surface and applying the rinsing liquid thereto.
References Cited (Backward Citations)
US832288A
Cited
US1678359A
Cited
US2605596A
Cited
US2817195A
Cited
US3447272A
Cited
US3775180A
Cited
US3891456A
Cited
US4038786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |