Patent US3786317A successfully refreshed from Google Patents.
US3786317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microelectronic circuit package
Assignee: AT&T Inc
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Filing: 1972-11-09
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Granted: 1974-01-15
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Expires: 1992-11-09
Abstract
Abstract A package for microelectronic circuits is disclosed in which the mounting mechanism isolates the circuit chip and encapsulating plastic from any applied stress when mounted. The mechanical force of the mounting mechanism is applied to a pair of tabs extending upward from a combination base/heat sink. This permits the applied stress to bypass the encapsulant and be transmitted directly to the heat sink and the mechanical support.
Inventors
- 👤 W Thierfelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:03
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/461; H10W70/481; H10W72/00; H10W72/50; H10W72/531; H10W72/5363; H10W72/541; H10W72/5449; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A packaged microelectronic circuit comprising a base to which the circuit is affixed; a plurality of tabs attached to the base and extending substantially perpendicularly upwards therefrom; a portion of each tab having a smaller cross-sectional dimension than a corresponding dimension at the remote end and spaced apart therefrom; means for encapsulating the circuit and at least a portion of each tab, whereby the encapsulating means is secured to the package by the interference between the encapsulant and the material of the tab beneath the remote end; and cap means for engaging the ends of the tabs remote from the base to mount the package in a desired position without applying stress to the encapsulant.
Claim 2
Dependent Claim
115 words
A packaged microelectronic circuit comprising a base to which the circuit is affixed; a plurality of tabs attached to the base and extending substantially perpendicularly upwards therefrom; a portion of each tab having a smaller cross-sectional dimension than a corresponding dimension at the remote end and spaced apart therefrom; means for encapsulating the circuit and at least a portion of each tab, whereby the encapsulating means is secured to the package by the interference between the encapsulant and the material of the tab beneath the remote end; and cap means for engaging the ends of the tabs remote from the base to mount the package in a desired position without applying stress to the encapsulant.
Claim 3
Dependent Claim
16 words
A packaged circuit in accordance with claim 1 wherein each tab has a substantially keystone shape.
Claim 4
Dependent Claim
33 words
A packaged circuit in accordance with claim 2 wherein the encapsulating means is plastic molded in a box-like shape having its upper surface below the plane of the remote ends of the tabs.
Claim 5
Dependent Claim
40 words
A packaged circuit in accordance with claim 3 wherein the engaging means include means to prevent lateral movement of the package; and members to engage the tabs and prevent movement of the package relative to the plane of the base.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |