US3693750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite metal structure useful in sound absorption
Assignee: 3M Co
•
Filing: 1970-09-21
•
Granted: 1972-09-26
•
Expires: 1990-09-21
Abstract
Abstract A composite metal structure, useful in sound absorption applications, comprising a metal part having perforations or recesses containing sintered porous powdered metal is made by pressing said metal part with a mixture of powdered metal and heat-fugitive binder to force said mixture into said perforations or recesses, and then heating the assembly to volatilize the burn-off said binder and sinter said powdered metal, the powdered metal in the resulting structure being held in said perforations or recesses by a metallurgically integral bond as well as mechanical bond.
Inventors
- 👤 Philip D Takkunen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:20
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; B32B15/00; B32B15/04; B32B15/043; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; B32B2305/00; B32B2305/02; B32B2305/024; B32B2307/00; B32B2307/10; B32B2307/102; E04B2001/742; E04B2001/748; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12097; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The panel of claim 1, wherein said part is a sheet of wrought, cast, or sintered powdered metal.
Claim 2
Dependent Claim
32 words
The panel of claim 2 wherein said bodies of sintered powdered metal are integral with a sheet of porous sintered powdered metal metallurgically integral by a sinter bond between the two sheets.
Claim 3
Dependent Claim
16 words
The panel of claim 2 wherein said metal part is a wrought sheet of stainless steel.
Claim 4
Dependent Claim
13 words
The panel of claim 2 wherein said powdered metal is powdered stainless steel.
Claim 5
Dependent Claim
82 words
A metal acoustical panel comprising a solid metal base sheet, a perforated metal sheet, a metal honeycomb structure interposed between and bonded to said sheets, a face sheet of sintered powdered metal sinter bonded to the top of said perforated metal sheet, and porous bodies of sintered powder metal in the range of -20 to +325 mesh integral with said face sheet and depending within said perforations of said perforated sheet, said bodies being metallurgically integral with the walls defining said perforations.
Claim 6
Dependent Claim
15 words
The article of claim 1 wherein said sheet and bodies are made of stainless steel.
References Cited (Backward Citations)
US2159488A
Cited
US2826309A
Cited
US3253675A
Cited
GB829012A
Cited
US3113634A
Cited
US3113635A
Cited
US3087572A
Cited
US3087574A
Cited
GB935119A
Cited
US3177972A
Cited
US3433322A
Cited
US3482703A
Cited
US3507355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |