US4155801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for masking sheet metal for chemical milling
Assignee: Rohr Inc
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Filing: 1977-10-27
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Granted: 1979-05-22
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Expires: 1997-10-27
Abstract
Abstract This process comprises the steps of depositing a suitable maskant which is resistant to the chemicals used in chem-milling on a back-up sheet such as thin plastic, punching or cutting the desired pattern to be removed from the sheet metal through the maskant and the back-up sheet, then applying the maskant by adhering the same to the sheet metal surface with the plastic back-up sheet on the outside surface. The back-up sheet/maskant combination is placed on both sides of the sheet metal where the thickness of the sheet metal requires chem-milling from both surfaces. For thin metal, one surface of the material can be directly coated with the maskant while the other surface employs the back-up sheet/maskant combination. After the adhesive operation, the plastic back-up sheet is then removed from the maskant and the sheet metal, with the maskant then remaining on the sheet metal, the sheet metal is then deposited in an appropriate chem-mill solution and the openings through the maskant material are caused to be etched away, the maskant is then removed from the finished sheet metal.
Inventors
- 👤 Donald A. Provancher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:44
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K2203/00; H05K2203/03; H05K2203/0323; H05K2203/05; H05K2203/0502; H05K2203/0537; H05K2203/06; H05K2203/063; H05K3/44; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A process of masking sheet metal for chem-milling openings therethrough comprising the steps of: (a) depositing a layer of chem-mill resistant material on a sheet of pliable lubricious material; (b) providing selected openings through the combined layer of chem-mill resistant material and the sheet of pliable lubricious material; (c) Adhering the pliable lubricious material with the layer of chem-mill resistant material on one surface of the sheet metal (d) Coating the remaining surfaces of said sheet metal with a layer of chem-mill resistant material; (e) removing the sheet of pliable lubricious material prior to chem-milling (f) chem-milling the sheet of sheet metal with the maskant deposited thereon, and (g) removing the maskant from the chem-milled sheet metal.
Claim 2
Dependent Claim
117 words
A process of masking sheet metal for chem-milling openings therethrough comprising the steps of: (a) depositing a layer of chem-mill resistant material on a sheet of pliable lubricious material; (b) providing selected openings through the combined layer of chem-mill resistant material and the sheet of pliable lubricious material; (c) Adhering the pliable lubricious material with the layer of chem-mill resistant material on one surface of the sheet metal (d) Coating the remaining surfaces of said sheet metal with a layer of chem-mill resistant material; (e) removing the sheet of pliable lubricious material prior to chem-milling (f) chem-milling the sheet of sheet metal with the maskant deposited thereon, and (g) removing the maskant from the chem-milled sheet metal.
Claim 3
Dependent Claim
136 words
A process of masking a thick piece of sheet metal for chem-milling openings therethrough comprising the steps of, (a) depositing a layer of chem-mill resistant material on one side of two sheets of pliable lubricious material; (b) providing symetrical openings through both of the separate combined layers of chem-mill resistant material and the sheets of pliable lubricious material; (c) adhering the resistant material sides of the sheets of pliable lubricious material to the opposing surfaces of the piece of sheet metal, with the symetrical openings in alignment; (d) coating the remaining surfaces of the sheet metal with a layer of chem-mill resistant material; (e) removing the sheet of pliable lubricious material prior to chem-milling; (f) chem-milling the sheet of sheet metal with the maskant deposited thereon, and (g) removing the maskant from the chem-milled sheet metal.
Claim 4
Dependent Claim
136 words
A process of masking a thick piece of sheet metal for chem-milling openings therethrough comprising the steps of, (a) depositing a layer of chem-mill resistant material on one side of two sheets of pliable lubricious material; (b) providing symetrical openings through both of the separate combined layers of chem-mill resistant material and the sheets of pliable lubricious material; (c) adhering the resistant material sides of the sheets of pliable lubricious material to the opposing surfaces of the piece of sheet metal, with the symetrical openings in alignment; (d) coating the remaining surfaces of the sheet metal with a layer of chem-mill resistant material; (e) removing the sheet of pliable lubricious material prior to chem-milling; (f) chem-milling the sheet of sheet metal with the maskant deposited thereon, and (g) removing the maskant from the chem-milled sheet metal.
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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |