US4581680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chip carrier mounting arrangement
Assignee: AG Communication Systems Corp
•
Filing: 1984-12-31
•
Granted: 1986-04-08
•
Expires: 2004-12-31
Abstract
Abstract A leadless ceramic chip carrier for surface mounting on an epoxy printed circuit board is shown featuring an arrangement for relieving the thermally induced stress by progressively lengthening the attaching solder pillars as the distance from the center line of the ceramic chip increases to avoid exceeding the elastic limits of the solder.
Inventors
- 👤 Robin E. Garner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:24
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/341; H05K3/3431; H05K3/3436; H05K2201/00; H05K2201/09; H05K2201/09009; H05K2201/09036; H05K2201/09209; H05K2201/09372; H05K2201/094; H05K2201/09472; H05K2201/10; H05K2201/10431; H05K2201/10568; H05K2201/20; H05K2201/2036; H10; H10W; H10W72/00; H10W72/071; H10W72/072; H10W72/07251; H10W72/07254; H10W72/20; H10W72/241; H10W72/242; H10W72/244; Y; Y02; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
A printed circuit board and leadless circuit chip carrier assembly comprising; a leadless integrated circuit ceramic chip, a plurality of conductors associated with said integrated circuit, said plurality of conductors extending to one face of said chip, a plurality of corresponding contact pads terminating said plurality of conductors on said one face, a printed circuit board including a corresponding plurality of circuit terminating contact pads, solder means connecting said corresponding circuit terminating pads of said circuit board and said ceramic chip, said contact pads on said one face on said ceramic chip characterized in that said pads are located in recesses in said chip face at a greater distance from said circuit board surface as the distance of their location from the center of the chip increases.
Claim 2
Dependent Claim
127 words
A printed circuit board and leadless circuit chip carrier assembly comprising; a leadless integrated circuit ceramic chip, a plurality of conductors associated with said integrated circuit, said plurality of conductors extending to one face of said chip, a plurality of corresponding contact pads terminating said plurality of conductors on said one face, a printed circuit board including a corresponding plurality of circuit terminating contact pads, solder means connecting said corresponding circuit terminating pads of said circuit board and said ceramic chip, said contact pads on said one face on said ceramic chip characterized in that said pads are located in recesses in said chip face at a greater distance from said circuit board surface as the distance of their location from the center of the chip increases.
Claim 3
Dependent Claim
35 words
A printed circuit board and chip carrier assembly as claimed in claim 1, wherein said greater distance from said circuit board surface is obtained by locating said circuit pads in recesses in said chip face.
Claim 4
Dependent Claim
21 words
A printed circuit board and chip carrier assembly as claimed in claim 1, wherein said chip carrier is a ceramic chip.
Claim 5
Dependent Claim
21 words
A printed circuit board and chip carrier assembly as claimed in claim 1, wherein said chip carrier is a plastic chip.
Claim 6
Dependent Claim
23 words
A printed circuit board and chip carrier assembly as claimed in claim 1, wherein said printed circuit board is an epoxy type board.
References Cited (Backward Citations)
US3149266A
Cited
US3373481A
Cited
US3486223A
Cited
US3777270A
Cited
US4238527A
Cited
US4417296A
Cited
US4437141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |