US4269800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a composite mat consisting of a layer of mineral wool and a layer of steel wool
Assignee: Saint Gobain Industries SA
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Filing: 1978-10-18
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Granted: 1981-05-26
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Expires: 1998-10-18
Abstract
Abstract Technique for making exhaust muffler lining comprising mineral fibers with metal fibers distributed therein toward the inner surface of the lining, the metal fibers being bound by the fiber binder carried by the mineral fibers.
Inventors
- 👤 Rolf Sommer
- 👤 Gustav Schweinfurth
- 👤 Heinz-Jurgen Ungerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:33
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; C; C04; C04B; C04B26/00; C04B26/02; C04B30/00; C04B30/02; D04H1/4218; D04H1/4226; D04H1/4234; D04H1/4382; D04H1/43835; D04H1/58; D04H1/64; F; F01; F01N; F01N1/00; F01N1/24; F01N2310/00; F01N2310/02; F01N2310/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
A process for making a composite fibrous mat incorporating a mixture of different types of fibers, comprising spraying a liquid thermo-hardenable binder on mineral fibers and forming the mat by scattering and depositing the mineral fibers onto a collecting surface, intertwining fleece-like metal fibers with the mineral fibers by distributing such metal fibers in the mineral fibers as the mineral fibers are being deposited to form the mat on the collecting surface, such distribution of the metal fibers in the mineral fibers being effected in at least one surface layer portion of the mat being formed, and heating the composite mat to harden the binder and thereby bond the mineral and metal fibers together.
Claim 2
Dependent Claim
114 words
A process for making a composite fibrous mat incorporating a mixture of different types of fibers, comprising spraying a liquid thermo-hardenable binder on mineral fibers and forming the mat by scattering and depositing the mineral fibers onto a collecting surface, intertwining fleece-like metal fibers with the mineral fibers by distributing such metal fibers in the mineral fibers as the mineral fibers are being deposited to form the mat on the collecting surface, such distribution of the metal fibers in the mineral fibers being effected in at least one surface layer portion of the mat being formed, and heating the composite mat to harden the binder and thereby bond the mineral and metal fibers together.
Claim 3
Dependent Claim
30 words
A process in accordance with claim 1, in which the quantity of the binder applied to the mineral fibers is not more than 1% by weight of the mineral fibers.
Claim 4
Dependent Claim
50 words
A process in accordance with claim 1, in which the quantity of the metal fibers distributed in the mineral fibers being deposited on the collecting surface to form the mat is greater in one surface layer portion of the mat than in the other surface layer portion of the mat.
References Cited (Backward Citations)
US3081207A
Cited
US3061888A
Cited
US3336716A
Cited
GB1070737A
Cited
US3923945A
Cited
US3811976A
Cited
US3923946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |