US4779674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sawtooth card retainer
Assignee: RTX Corp
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Filing: 1987-11-25
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Granted: 1988-10-25
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Expires: 2007-11-25
Abstract
Abstract A printed circuit board heat sink retainer is disclosed comprising a mating pair of sawtoothed bars with slidably engaging teeth. The bars are laterally spread apart and held by a forcing device, which may be a screw or a spring, in order to push against and hold a heat sink in a channel. The distance between successive teeth may be constant in both bars or may be constant in one bar and may decrease in a direction toward the forcing device in the second bar.
Inventors
- 👤 Christopher T. McNulty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:07
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/14; H05K7/1401; H05K7/1402; H05K7/1404; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7062; Y10T403/7064; Y10T403/7066; Y10T403/7067; Y10T403/7069
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A printed circuit board heat sink retainer, comprising: a first sawtoothed piece bonded to an internal chassis wall between a pair of ribs integral to said wall and butted up against one of the ribs wherein the distance between successive teeth is a first selected constant; a second sawtoothed piece loosely held between the ribs for mating its sawteeth with the teeth of the first piece and wherein the distance between successive teeth is a second selected constant lesser than the first selected constant; and spread apart and hold means, for providing spreading forces which spread said first and second pieces apart such that the second piece pushes against a heat sink inserted between it and a rib and which forces hold the second piece in place against the heat sink.
Claim 2
Dependent Claim
131 words
A printed circuit board heat sink retainer, comprising: a first sawtoothed piece bonded to an internal chassis wall between a pair of ribs integral to said wall and butted up against one of the ribs wherein the distance between successive teeth is a first selected constant; a second sawtoothed piece loosely held between the ribs for mating its sawteeth with the teeth of the first piece and wherein the distance between successive teeth is a second selected constant lesser than the first selected constant; and spread apart and hold means, for providing spreading forces which spread said first and second pieces apart such that the second piece pushes against a heat sink inserted between it and a rib and which forces hold the second piece in place against the heat sink.
References Cited (Backward Citations)
US3112496A
Cited
US4298905A
Cited
US4314736A
Cited
US4318157A
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US4461522A
Cited
US4518476A
Cited
US4721155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |