Patent US3746431A successfully refreshed from Google Patents.
Patent US4628409A successfully refreshed from Google Patents.
US4628409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit boards
Assignee: DESIGN TO DISTRIBUTION Ltd
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Filing: 1986-02-14
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Granted: 1986-12-09
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Expires: 2006-02-14
Abstract
Abstract A printed circuit board which facilitates the removal and replacement of components. The circuit board (1) has unplated holes (8) extending therethrough for receiving connection pins (3) of components (2) mounted on one face of the circuit board (1). The pins (3) protrude from the opposite face of the circuit board (1) and are soldered to conductive pads (9) on this face which are connected by surface conductors (10) to plated through-holes (4) linking conductive tracks (6,7) at different layers of the circuit board (1).
Inventors
- 👤 Gordon L. Thompson
- 👤 Brian Gudgeon
- 👤 Kenneth J. Wombwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:02
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0094; H05K1/00; H05K1/02; H05K1/11; H05K1/115; H05K3/30; H05K3/32; H05K3/34; H05K3/3447; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/09372; H05K2201/0949; H05K2201/095; H05K2201/09627; H05K2203/00; H05K2203/13; H05K2203/1377; H05K2203/1394; H05K2203/17; H05K2203/176; H05K3/22; H05K3/225; H05K3/3452; H05K3/40; H05K3/42; H05K3/429; H05K3/46; H05K3/4644; H05K3/4673; H05K3/4676; H05K3/4688
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A multilayer printed circuit board including a plurality of internal conductive layers comprising conductive tracks; a plurality of unplated holes extending through the circuit board; a plurality of plated through-holes extending through the circuit board and being connected to selected ones of said conductive tracks of different layers; a surface pad of conductive material adjacent each unplated hole at a first face of the circuit board; surface conductors on said first face connecting at least some of the surface pads directly to plated through holes; at least one component having connection pins, each pin extending into an unplated hole and being soldered to its adjacent surface pad; and a layer of solder resist material extending over the plated through-holes at said first face.
Claim 2
Dependent Claim
123 words
A multilayer printed circuit board including a plurality of internal conductive layers comprising conductive tracks; a plurality of unplated holes extending through the circuit board; a plurality of plated through-holes extending through the circuit board and being connected to selected ones of said conductive tracks of different layers; a surface pad of conductive material adjacent each unplated hole at a first face of the circuit board; surface conductors on said first face connecting at least some of the surface pads directly to plated through holes; at least one component having connection pins, each pin extending into an unplated hole and being soldered to its adjacent surface pad; and a layer of solder resist material extending over the plated through-holes at said first face.
Claim 3
Dependent Claim
22 words
A printed circuit board as claimed in claim 1 in which said first face of the circuit board comprises a polyimide-glass layer.
Claim 4
Dependent Claim
45 words
A multilayer printed circuit board as claimed in claim 1 in which said component is situated on a second face of the circuit board opposite said first face and its connection pins extend through the unplated holes to the surface pads on the first face.
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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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |