Patent US4617585A successfully refreshed from Google Patents.
US4617585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic enclosing device
Assignee: Toshiba Corp
•
Filing: 1985-12-24
•
Granted: 1986-10-14
•
Expires: 2005-12-24
Abstract
Abstract A plastic enclosing device has a circuit element enclosed in a plastic. The element is connected with a plurality of external leads which are close to each other and a high voltage is provided to the device. They are enclosed with a plastic enclosure having a notch or step between the leads in order to increase a surface distance therebetween.
Inventors
- 👤 Mitsuru Yasui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:33
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/10; H10W74/111; H10W70/00; H10W70/40; H10W70/481; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
A plastic enclosing device installed on an external plate comprising: an element usable as a circuit element and having a plurality of terminals; a plurality of leads connected with said terminals of said element; and a plastic enclosure enclosing the element and a part of said leads, and having at least one main surface which is contacted with the external plate, and at least one side surface from which the leads extend outwardly, wherein a first step portion of said enclosure is formed at an intersection of the at least one main surface and the at least one side surface at a position between said plurality of leads and said external plate in order to increase a surface distance therebetween, and a second step portion of said enclosure is formed on the at least one side surface at a position between the leads.
Claim 2
Dependent Claim
143 words
A plastic enclosing device installed on an external plate comprising: an element usable as a circuit element and having a plurality of terminals; a plurality of leads connected with said terminals of said element; and a plastic enclosure enclosing the element and a part of said leads, and having at least one main surface which is contacted with the external plate, and at least one side surface from which the leads extend outwardly, wherein a first step portion of said enclosure is formed at an intersection of the at least one main surface and the at least one side surface at a position between said plurality of leads and said external plate in order to increase a surface distance therebetween, and a second step portion of said enclosure is formed on the at least one side surface at a position between the leads.
Claim 3
Dependent Claim
29 words
A plastic enclosing device according to claim 1, wherein the element is a transistor and the leads are respectively connected with the emitter, base and collector of the transistor.
Claim 4
Dependent Claim
27 words
A plastic enclosing device according to claim 2, wherein the second step portion is formed between the leads connected with the base and collector of the transistor.
Claim 5
Dependent Claim
16 words
A plastic enclosing device according to claim 1, wherein the second step portion is a groove.
Claim 6
Dependent Claim
20 words
A plastic enclosing device according to claim 1, wherein one of the leads is exposed on the one main surface.
Claim 7
Dependent Claim
27 words
A plastic enclosing device according to claim 1, wherein a hole is formed in the plastic enclosure in order to install the device to the external plate.
Claim 8
Dependent Claim
17 words
A plastic enclosing device according to claim 1, wherein the external plate is a heat radiation plate.
Claim 9
Dependent Claim
17 words
A plastic enclosing device according to claim 1, wherein said first and second step portions are notches.
References Cited (Backward Citations)
US3236936A
Cited
US3390226A
Cited
US3581387A
Cited
US3606673A
Cited
JPS522280A
Cited
US4507675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |