US3716347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal parts joined with sintered powdered metal
Assignee: 3M Co
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Filing: 1970-09-21
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Granted: 1973-02-13
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Expires: 1990-09-21
Abstract
Abstract Metal parts are joined together with sintered powdered metal by applying a mixture of powdered metal and an organic heat-fugitive binder to the parts at the locus of the joint of to be formed therebetween, assembling the parts in their desired joined configuration, and heating the assembly to volatilize or burn-off the binder and sinter the powdered metal.
Inventors
- 👤 T Bergstrom
- 👤 P Takkunen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:27
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/308; B23K35/3086; B23K35/001; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12063; Y10T428/12069; Y10T428/12104; Y10T428/12111; Y10T428/1234; Y10T428/12375; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965; Y10T428/24; Y10T428/24149; Y10T428/31504; Y10T428/31826; Y10T428/31841
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
30 words
An article comprising wrought, cast, previously sintered, or porous metal parts joined together by a metallurgically integral joint of sintered powdered metal interposed between contiguous surfaces of said metal parts.
Claim 2
Dependent Claim
30 words
An article comprising wrought, cast, previously sintered, or porous metal parts joined together by a metallurgically integral joint of sintered powdered metal interposed between contiguous surfaces of said metal parts.
Claim 3
Dependent Claim
15 words
The article of claim 1 wherein said metal parts and powdered metal are stainless steel.
Claim 4
Dependent Claim
18 words
The article of claim 1 wherein said article is a honeycomb sandwich structure made of wrought metal parts.
Claim 5
Dependent Claim
15 words
The article of claim 1 wherein said joint is in the form of a fillet.
Claim 6
Dependent Claim
11 words
The article of claim 1 wherein said joint is a T-joint.
Claim 7
Dependent Claim
12 words
The article of claim 1 wherein said joint is a lap joint.
Claim 8
Dependent Claim
53 words
A method for forming an article according to claim 1, which comprises interposing between said metal parts a mixture comprising powdered metal and a heat-fugitive binder, assembling said parts in a desired joint configuration, and heating the assembly to remove said binder and sinter said powdered metal to form said metallurgically integral joint.
Claim 9
Dependent Claim
13 words
The method according to claim 7, wherein said binder comprises a thermosetting material.
Claim 10
Dependent Claim
34 words
An article comprising wrought, cast, previously sintered, or porous metal parts joined together by a green bonding material comprising a mixture of powdered metal and a solid heat-fugitive, cured, thermosetting material as a binder.
Claim 11
Dependent Claim
34 words
An article comprising wrought, cast, previously sintered, or porous metal parts joined together by a green bonding material comprising a mixture of powdered metal and a solid heat-fugitive, cured, thermosetting material as a binder.
Claim 12
Dependent Claim
42 words
A honeycomb sandwiched structure made of wrought metal parts comprising a metal honeycomb structure disposed between two metal sheets, and sintered powdered metal in the form of metallurgically integral fillet joints joining the contiguous portions of said honeycomb structure and said sheets.
Claim 13
Dependent Claim
42 words
A honeycomb sandwiched structure made of wrought metal parts comprising a metal honeycomb structure disposed between two metal sheets, and sintered powdered metal in the form of metallurgically integral fillet joints joining the contiguous portions of said honeycomb structure and said sheets.
Claim 14
Dependent Claim
23 words
The structure according to claim 10 wherein said two metal sheets are non-perforated and wherein said honeycomb structure has holes in its web.
Claim 15
Dependent Claim
25 words
The structure according to claim 10 wherein one of said sheets is an impervious backing sheet and the other sheet is a perforated face sheet.
Claim 16
Dependent Claim
22 words
The structure according to claim 12 wherein a porous metal sheet is sintered to the top surface of said perforated face sheet.
Claim 17
Dependent Claim
17 words
The structure according to claim 13 wherein said porous metal sheet is a sintered powdered metal sheet.
Claim 18
Independent Claim
72 words
A method for forming a honeycomb sandwiched structure made of wrought metal parts comprising a previously metal honeycomb structure interposed between two metal sheets, which comprises interposing between said honeycomb structure and said sheets a mixture comprising powdered metal and a heat-fugitive thermosetting binder, and heating the assembly to remove said binder and sinter said powdered metal to form metallurgically integral joints between contiguous portions of said honeycomb structure and said sheets.
Claim 19
Independent Claim
72 words
A method for forming a honeycomb sandwiched structure made of wrought metal parts comprising a previously metal honeycomb structure interposed between two metal sheets, which comprises interposing between said honeycomb structure and said sheets a mixture comprising powdered metal and a heat-fugitive thermosetting binder, and heating the assembly to remove said binder and sinter said powdered metal to form metallurgically integral joints between contiguous portions of said honeycomb structure and said sheets.
Claim 20
Dependent Claim
38 words
The method according to claim 15 wherein one of said sheets is an impervious backing sheet and the other sheet is a perforated facing sheet having a porous sintered powdered metal sheet sintered to the top surface thereof.
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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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |