US4365736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing high stability joint
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1981-04-27
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Granted: 1982-12-28
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Expires: 2001-04-27
Abstract
Abstract A structural joint wherein the intersecting members share at least one uninterrupted common surface to provide a particularly stable joint. In the preferred embodiment the composite material elements are protectively coated to prevent moisture absorption, and this coating is later utilized to bond the elements together to form the joint.
Inventors
- 👤 James E. Stumm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:58
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/38; E04B1/58; E04B1/5806; B; B23; B23K; B23K1/00; B23K1/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
A method for joining a plurality of structural elements having tabs and slots thereon to form a structural member comprising the steps of: (a) coating each element with an electoless nickel plating; (b) coating said nickel plating with a wetting coat selected from a group of electroless coatings consisting of tin and gold; (c) flowing molten solder over said wetting coat while said element is suspended in an acidified ethylene glycol solution; (d) interlocking said elements together with the tabs of one element engaged in mating slots of the other element to form said structural member; and (e) heating the mating surfaces of the interlocked surfaces to reflow the solder sufficiently to obtain a structural bond.
Claim 2
Independent Claim
116 words
A method for joining a plurality of structural elements having tabs and slots thereon to form a structural member comprising the steps of: (a) coating each element with an electoless nickel plating; (b) coating said nickel plating with a wetting coat selected from a group of electroless coatings consisting of tin and gold; (c) flowing molten solder over said wetting coat while said element is suspended in an acidified ethylene glycol solution; (d) interlocking said elements together with the tabs of one element engaged in mating slots of the other element to form said structural member; and (e) heating the mating surfaces of the interlocked surfaces to reflow the solder sufficiently to obtain a structural bond.
Claim 3
Dependent Claim
26 words
The method as defined in claim 1 including the additional step of preparing the surface of said elements to receive a plating prior to step (a).
Claim 4
Dependent Claim
16 words
The method as defined in claim 1 including mechanically agitating the nickel plating during step (a).
Claim 5
Dependent Claim
23 words
The method as defined in claim 3 including elevating the temperature of the nickel plating solution to approximately 170° F. during step (a).
Claim 6
Dependent Claim
45 words
The method as defined in claim 1 including placing the elements in a vacuum oven for at least 72 hours at at least 5×10 -2 tor and elevating the oven temperature to a range of from 180° to 190° F. between steps (b) and (c).
Claim 7
Dependent Claim
24 words
The method as defined in claim 5 including performing step (c) within 45 minutes of the removal of the elements from the vacuum oven.
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |