US5160547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing coatings from sensitive substrates, and blasting media useful therein
Assignee: Church and Dwight Co Inc
•
Filing: 1991-05-17
•
Granted: 1992-11-03
•
Expires: 2011-05-17
Abstract
Abstract Blasting media for removing coatings from sensitive metal and composite surfaces, and a process useful therewith, wherein the blasting media comprise mixtures of water-soluble crystalline sodium bicarbonate particles having average particle sizes of from 100-500 microns.
Inventors
- 👤 Lawrence Kirschner
- 👤 Michael S. Lajoie
- 👤 William E. Spears, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:20
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C1/003; B24C11/00; C; C01; C01D; C01D7/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A process for removing coatings from sensitive metal and composite surfaces, which comprises blasting said surfaces with a substantially water saturated compressed air stream under pressures of 10-150 psi, said stream containing as a blasting medium sodium bicarbonate particles having particle sizes within the range of 250-300 microns, in admixture with from 0.2 to 3% of a hydrophobic silica flow/anti-caking agent, by weight of the bicarbonate.
Claim 2
Dependent Claim
66 words
A process for removing coatings from sensitive metal and composite surfaces, which comprises blasting said surfaces with a substantially water saturated compressed air stream under pressures of 10-150 psi, said stream containing as a blasting medium sodium bicarbonate particles having particle sizes within the range of 250-300 microns, in admixture with from 0.2 to 3% of a hydrophobic silica flow/anti-caking agent, by weight of the bicarbonate.
Claim 3
Dependent Claim
20 words
The process of claim 1, wherein the hydrophobic silica is substantially free of non-hydrogen bonded silanol groups and adsorbed water.
Claim 4
Dependent Claim
28 words
The process of claim 1, wherein the blast stream is applied to the surface treated at a rate of 1-10 pounds of the sodium bicarbonate particles per minute.
Claim 5
Dependent Claim
46 words
A blasting medium for removing coatings from sensitive metal and composite surfaces, which consists essentially of sodium bicarbonate particles having particle sizes within the range of 250-300 microns, in admixture with from 0.2 to 3% of a hydrophobic silica flow/anti-caking agent, by weight of the bicarbonate.
Claim 6
Dependent Claim
46 words
A blasting medium for removing coatings from sensitive metal and composite surfaces, which consists essentially of sodium bicarbonate particles having particle sizes within the range of 250-300 microns, in admixture with from 0.2 to 3% of a hydrophobic silica flow/anti-caking agent, by weight of the bicarbonate.
Claim 7
Dependent Claim
21 words
The blasting medium of claim 4, wherein the hydrophobic silica is substantially free of non-hydrogen bonded silanol groups and adsorbed 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) | 1995-11-03 | 1996-05-04 | 1996-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-03 | 2000-05-04 | 2000-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-03 | 2004-05-04 | 2004-11-03 | $7700.00 | Window Closed / Lapsed |