US4678531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for screen printing solder paste onto a substrate with device premounted thereon
Assignee: Motors Liquidation Co
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Filing: 1986-03-24
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Granted: 1987-07-07
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Expires: 2006-03-24
Abstract
Abstract A printing screen for screen printing fabrication substances such as solder paste has an aperture formed therein so that the screen may be placed on a substrate surface with a pre-mounted device extending through the aperture. A metal cap is bonded to the screen over the pre-mounted device to protect the device against damage during a subsequent screen printing operation. Different elements may, therefore, be bonded to a substrate in completely independent steps without the need for fluxing operations in later bonding operations.
Inventors
- 👤 David B. Metzger
- 👤 Glenn S. Johnson
- 👤 Michael D. Bramel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:51
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0448; B; B41; B41C; B41C1/00; B41C1/14; H05; H05K; H05K3/00; H05K3/10; H05K3/12; H05K3/1216; H05K3/1225; H05K2203/00; H05K2203/30; H05K2203/304; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A method for screen printing an electrical fabrication substance onto a substrate surface to which a device having substantial height relative to the thickness of the printing screen has been previously mounted comprising the steps of: (a) preparing a printing screen to permit through-flow of said bonding substance only in one or more pre-selected areas; (b) forming a hole in said screen of such size and location as to conform to said device; (c) bonding a substance-impervious cap to the screen so as to cover said hold and said device; (d) laying said screen over said substrate with the device being disposed within said hole; (e) and thereafter applying said substance to the exposed surface of said screen to cause said substance to flow through said pre-selected areas.
Claim 2
Independent Claim
128 words
A method for screen printing an electrical fabrication substance onto a substrate surface to which a device having substantial height relative to the thickness of the printing screen has been previously mounted comprising the steps of: (a) preparing a printing screen to permit through-flow of said bonding substance only in one or more pre-selected areas; (b) forming a hole in said screen of such size and location as to conform to said device; (c) bonding a substance-impervious cap to the screen so as to cover said hold and said device; (d) laying said screen over said substrate with the device being disposed within said hole; (e) and thereafter applying said substance to the exposed surface of said screen to cause said substance to flow through said pre-selected areas.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the step of applying said substance is carried out with a squeegee which flexes over said cap.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the substance is solder paste.
Claim 5
Dependent Claim
90 words
Apparatus for applying an electrical fabrication substance by screen printing to selected areas of a surface of a substrate to which a device of substantial height relative to the printing screen thickness has previously been mounted comprising: (a) a printing screen for overlying said substrate surface and which is impervious to the through-flow of said substance except in one or more pre-selected areas; said screen having an aperture formed therein to accommodate said device; and (b) a substance-impervious cap for covering said device bonded to said screen over said aperture.
Claim 6
Dependent Claim
90 words
Apparatus for applying an electrical fabrication substance by screen printing to selected areas of a surface of a substrate to which a device of substantial height relative to the printing screen thickness has previously been mounted comprising: (a) a printing screen for overlying said substrate surface and which is impervious to the through-flow of said substance except in one or more pre-selected areas; said screen having an aperture formed therein to accommodate said device; and (b) a substance-impervious cap for covering said device bonded to said screen over said aperture.
Claim 7
Dependent Claim
14 words
Apparatus as defined in claim 4 wherein the cap is essentially frusto-pyramidal in shape.
Claim 8
Dependent Claim
23 words
Apparatus as defined in claim 4 further including squeegee means for applying the substance to the printing screen and to the substrate areas.
Claim 9
Dependent Claim
13 words
Apparatus as defined in claim 4 wherein the fabrication substance is solder paste.
Claim 10
Dependent Claim
32 words
Apparatus as defined in claim 4 wherein the cap is bonded to the screen with cement, the cement being applied so as to form a fillet between the screen and the cap.
Claim 11
Dependent Claim
13 words
Apparatus as defined in claim 4 wherein the cap is made of metal.
Claim 12
Dependent Claim
14 words
Appartus as defined in claim 4 wherein the device is an electrical circuit chip.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |