US4947288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board for mounting in a backplane
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1989-08-31
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Granted: 1990-08-07
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Expires: 2009-08-31
Abstract
Abstract The present invention relates to a printed circuit board provided with electrical contact devices (7) and intended to be mounted in the back plane of a card frame (2) such as to form a magazine (1) in which printed circuit cards (6) having electrical contact devices (8) corresponding to the contact devices (7) on the board can be inserted at right angles to the back plane. The circuit board (3) forms an electrical connecting unit for the circuit cards in the back plane of the magazine. In accordance with the invention, the circuit board is configured to provide a self-supporting and stiffening structure in the form of a sandwich element (10).
Inventors
- 👤 Torbjorn R. Olsson
- 👤 Bjorn T. Kassman
- 👤 Karl Gustaf Olsson
- 👤 Stig C. Ernolf
- 👤 Per-Ove Nilsson
- 👤 Rolf I. B. Kjellsson
- 👤 Lars H. Widoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:02
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/18; H05K7/14; H05K7/1438; H05K7/1439; H05K3/00; H05K3/0058; H05K3/0064; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0116; H05K2201/0133; H05K2201/0183; H05K2201/0195; H05K2201/04; H05K2201/044
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A printed circuit board provided with electrical contact devices mounted on a back plane of a card frame so as to form a magazine in which printed circuit cards can be inserted perpendicularly to said back plane, said circuit cards having electrical contact devices which correspond to said contact devices on said printed circuit board, said printed circuit board forming an electrical connecting unit for said circuit cards located on said back plane of the magazine, wherein said printed circuit board is a self-supporting and stiffening construction in the form of a sandwich element, said sandwich element comprising a spacer element which is bonded adhesively to said printed circuit board and to a bottom plate.
Claim 2
Dependent Claim
115 words
A printed circuit board provided with electrical contact devices mounted on a back plane of a card frame so as to form a magazine in which printed circuit cards can be inserted perpendicularly to said back plane, said circuit cards having electrical contact devices which correspond to said contact devices on said printed circuit board, said printed circuit board forming an electrical connecting unit for said circuit cards located on said back plane of the magazine, wherein said printed circuit board is a self-supporting and stiffening construction in the form of a sandwich element, said sandwich element comprising a spacer element which is bonded adhesively to said printed circuit board and to a bottom plate.
Claim 3
Dependent Claim
21 words
A printed circuit board according to claim 1, characterized in that the spacer element comprises a layer of a foamed plastic.
Claim 4
Dependent Claim
30 words
A printed circuit board according to claim 1, wherein said bottom plate is made of a material which has the same coefficient of linear expansion as said printed circuit board.
Claim 5
Dependent Claim
24 words
A printed circuit board according to claim 1, wherein said spacer element covers the whole of the rear surface of said printed circuit board.
Claim 6
Dependent Claim
37 words
A printed circuit board according to claim 1, wherein said spacer element is mounted on said printed circuit board subsequent to said printed circuit board having been completed and tested and provided with said electrical contact devices.
Claim 7
Dependent Claim
38 words
A printed circuit board according to claim 1, wherein said printed circuit board is provided along the edges thereof with through-passing holes for attaching said printed circuit board to said card frame with the aid of screw fasteners.
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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |