Patent US1473764A successfully refreshed from Google Patents.
Patent US4379318A successfully refreshed from Google Patents.
US4379318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overcurrent safety construction for a printed circuit board
Assignee: Nissan Motor Co Ltd
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Filing: 1980-09-16
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Granted: 1983-04-05
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Expires: 2000-09-16
Abstract
Abstract In a printed circuit board, a safety means is provided to prevent the circuit elements such as semiconductor devices, resistors, and the like from suffering damage due to overcurrent flow. The safety means thus improved has a narrow gap provided within a metal foil pattern on the surface of the printed circuit board and a low-melting point metal such as solder bridges this gap to connect the metal foil.
Inventors
- 👤 Tetsuo Ootsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:10
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3468; H05K1/00; H05K1/02; H05K1/0286; H05K1/0293; H05K1/11; H05K2201/00; H05K2201/03; H05K2201/0302; H05K2201/0305; H05K2201/09; H05K2201/09209; H05K2201/09372; H05K2201/09381; H05K2201/10; H05K2201/10007; H05K2201/10181; H05K2203/00; H05K2203/17; H05K2203/173; H05K2203/175; H05K3/3447; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49107; Y10T29/49117; Y10T29/49124; Y10T29/49155
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
123 words
A method of manufacturing a printed circuit board having an overcurrent safety construction for protecting electrical components of the printed circuit board against overcurrent damage, which comprises the steps of: (a) forming a metal foil pattern on the board and simultaneously forming a narrow gap in said metal foil between the position at which said pattern is to be connected to a power source and the position at which said components to be protected are to be mounted on said board; (b) mounting said circuit components on said board; and (c) dipping the printed circuit board in a reservoir of molten solder so as to form simultaneously a bridge across the gap and connections to said components in circuit mounted on the board.
Claim 2
Independent Claim
123 words
A method of manufacturing a printed circuit board having an overcurrent safety construction for protecting electrical components of the printed circuit board against overcurrent damage, which comprises the steps of: (a) forming a metal foil pattern on the board and simultaneously forming a narrow gap in said metal foil between the position at which said pattern is to be connected to a power source and the position at which said components to be protected are to be mounted on said board; (b) mounting said circuit components on said board; and (c) dipping the printed circuit board in a reservoir of molten solder so as to form simultaneously a bridge across the gap and connections to said components in circuit mounted on the board.
Claim 3
Dependent Claim
28 words
The method as set forth in claim 1 wherein the step of forming a narrow gap comprises forming said narrow gap in the form of non-aligned line segments.
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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) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |