US5094696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing paint
Assignee: Linde Sverige AB
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Filing: 1988-04-25
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Granted: 1992-03-10
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Expires: 2008-04-25
Abstract
Abstract The invention relates to a blasting method for removing coatings of paint, varnish or like substances from objects coated with such substances, in which the objects are cooled in a condensed gas, e.g. liquid nitrogen, and then subjected, in a chilled state, to the effect of a blasting agent, e.g. steel shot, delivered by a blasting machine. The coating fragments dislodged are collected together with the blasting agent and mutually separated one from the other in a separator. The recovered blasting agent is then returned to the blasting machine. The method is characterized by adding an absorbent to the blasting agent in the blasting machine.
Inventors
- 👤 Mikael Orsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:30
CPC Classifications
B; B44; B44D; B44D3/00; B44D3/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
A blasting method for removing coatings from objects comprising the steps of: cooling the objects in a condensed gas, blasting said objects, in a chilled state, with a blasting agent, delivered by a blasting machine, collecting coating fragments and blasting agents and mutually separating said fragments and said blasting agent in a separator, returning the blasting agent to the blasting machine, and adding an absorbent to the blasting agent.
Claim 2
Dependent Claim
69 words
A blasting method for removing coatings from objects comprising the steps of: cooling the objects in a condensed gas, blasting said objects, in a chilled state, with a blasting agent, delivered by a blasting machine, collecting coating fragments and blasting agents and mutually separating said fragments and said blasting agent in a separator, returning the blasting agent to the blasting machine, and adding an absorbent to the blasting agent.
Claim 3
Dependent Claim
16 words
A method according to claim 1, characterized by adding a granular absorbent to said blasting agent.
Claim 4
Dependent Claim
19 words
A method according to claim 1 or 2, characterized by adding an oil absorbing substance to said blasting agent.
Claim 5
Dependent Claim
18 words
A method according to claim 1 or 2, characterized by adding a mineral absorbent to the blasting agent.
Claim 6
Dependent Claim
18 words
A method according to claim 1 further comprising the step of continuously adding absorbent to the blasting agent.
Claim 7
Dependent Claim
40 words
A method according to claim 1 further comprising the step of periodically adding absorbent, to the blasting agent the times of such periodic addition being equal to the time taken for the blasting agent to circulate in the blasting machine.
Claim 8
Dependent Claim
32 words
A method according to claim 1 further comprising the step of periodically adding absorbent to the blasting agent, the times of said periodic addition corresponding to the treatment time of said object.
Claim 9
Dependent Claim
13 words
The method according to claim 1, wherein the condensed gas is liquid nitrogen.
Claim 10
Dependent Claim
12 words
The method of claim 1, wherein the blasting agent is steel shot.
Claim 11
Dependent Claim
15 words
A method according to claim 1, wherein the blasting machine is a shot blasting machine.
Claim 12
Dependent Claim
15 words
The method according the claim 1, wherein the blasting machine has a blasting agent magazine.
Claim 13
Dependent Claim
20 words
The method according to claim 11, further comprising the step of continuously adding the absorbent to the blasting agent magazine.
Claim 14
Dependent Claim
20 words
The method according to claim 11, further comprising the step of periodically adding the absorbent to the blasting agent magazine.
Claim 15
Dependent Claim
12 words
The method according to claim 1, wherein the blasting agent is sand.
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) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |