US4759774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cleaning substrates
Assignee: EIDP Inc
•
Filing: 1986-10-23
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Granted: 1988-07-26
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Expires: 2006-10-23
Abstract
Abstract Particulate polymethyl methacrylate polymerized in the presence of alumina trihydrate filler provides a superior blasting media for cleaning surfaces, such as for stripping paint from sensitive substrates like aluminum aircraft skin.
Inventors
- 👤 Jerome Hochberg
- 👤 Robert B. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:16
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; B; B24; B24C; B24C11/00; B24D; B24D3/00; B24D3/008; B24D3/02; B24D3/20; B24D3/28; B24D3/34; B24D3/346; C08F; C08F292/00; C08K3/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
A blasting process for cleaning surfaces in which a media, entrained in a fluid, is propelled against such surfaces wherein said media is particulate polymethyl methacrylate filled with particles of inorganic materials selected from aluminum trihydrate and barium sulfate.
Claim 2
Dependent Claim
39 words
A blasting process for cleaning surfaces in which a media, entrained in a fluid, is propelled against such surfaces wherein said media is particulate polymethyl methacrylate filled with particles of inorganic materials selected from aluminum trihydrate and barium sulfate.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the polymethyl methacrylate has been polymerized in the presence of aluminum trihydrate.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the aluminum oxide material is alumina trihydrate plus barium sulfate.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said media is in the form of particles having an average diameter in the range of 0.18 mm-2.0 mm.
Claim 6
Dependent Claim
16 words
The process of claim 1 in which the polymethyl methacrylate is copolymerized with ethylenically unsaturated comonomer.
Claim 7
Dependent Claim
26 words
The process of claim 1 in which the polymethyl methacrylate is copolymerized with crosslinkable monomer and the copolymer is crosslinked during manufacture of the filled polymer.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |