Patent US4299866A successfully refreshed from Google Patents.
US4299866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating process mask
Assignee: International Business Machines Corp
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Filing: 1979-07-31
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Granted: 1981-11-10
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Expires: 1999-07-31
Abstract
Abstract This invention describes a method of masking a workpiece to prevent the adhesion of a deposited tightly adhering conformal coating formed from the condensation of a vaporous diradical such as paraxylylene on selected portions of the workpiece. Specifically the process of the invention requires the covering of the areas of the workpiece, to which adhesion is not desired, with a non-polymerizing hydrocarbon and placing the covered area in close contact with an open cellular material containing a predominance of interconnecting cells which provides a large surface area for condensation of the unwanted condensate of the diradical, exposing the workpiece to the vaporous diradical, removing the workpiece from the open cellular material and immersing the workpiece in a solvent for swelling and dissolving the hydrocarbon covering.
Inventors
- 👤 Roger J. Clark
- 👤 Robert E. Kennison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:20
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/60; B05D1/32; B05D1/322; B05D1/327; H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/284; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0179; H05K2201/09; H05K2201/09818; H05K2201/09872; H05K2201/10; H05K2201/10227; H05K2201/10295; H05K2201/10303; H05K2203/00; H05K2203/30; H05K2203/304
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
In a process for removing a polymer from a defined area on a body by masking the defined area on the body which is to be coated with a polymer the improvement comprising the steps of: coating the defined area with a swellable, dissolvable, non-polymerizable hydrocarbon, coating the body with a polymer, applying an external force to said polymer coating over said defined area sufficient to create openings in said polymer coating over said defined area, and immersing the body in a swelling agent for said swellable, dissolvable, non-polymerizable hydrocarbon that will penetrate said openings and swell and dissolve said hydrocarbon to rupture and remove the polymer from said defined area while leaving the remainder of the body coated with the polymer.
Claim 2
Dependent Claim
122 words
In a process for removing a polymer from a defined area on a body by masking the defined area on the body which is to be coated with a polymer the improvement comprising the steps of: coating the defined area with a swellable, dissolvable, non-polymerizable hydrocarbon, coating the body with a polymer, applying an external force to said polymer coating over said defined area sufficient to create openings in said polymer coating over said defined area, and immersing the body in a swelling agent for said swellable, dissolvable, non-polymerizable hydrocarbon that will penetrate said openings and swell and dissolve said hydrocarbon to rupture and remove the polymer from said defined area while leaving the remainder of the body coated with the polymer.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said polymer is formed from a monomer vapor.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein said polymer is paraxylylene.
Claim 5
Dependent Claim
67 words
The process of claim 3 wherein after said body is coated with said hydrocarbon and before coating the body with said polymer there is further provided a step of maintaining an open cellular plastic foam on said defined area during the deposition of the paraxylylene and the step of applying an external force to said polymer coating consists of removing the foam when said deposition is completed.
Claim 6
Dependent Claim
35 words
The process of claim 4 wherein said foam is formed by reacting low molecular weight polyols with a functionality of two or more with polymeric isocyanates in the presence of catalysts, surfactants, and blowing agents.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein said polyol is a polyether.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein said polyol is a polyester.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein said hydrocarbon when coated on the body is at a viscosity of between 22 and 32 Zahn-seconds.
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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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |