US5346868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic fiber
Assignee: Unifrax I LLC
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Filing: 1993-06-08
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Granted: 1994-09-13
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Expires: 2013-06-08
Abstract
Abstract The invention relates to inorganic fibers, and a process for their production. The inorganic fibers lose their fiber form factor after a short contact period with water or a physiological body fluid, so that danger to health is not expected from such fibers remaining for a prolonged period of time in or on human tissue. The fiber of the invention is characterized by the fact that at least 90% of it comprises 20-50% by weight of CaO and 50-80% by weight of Al 2 O 3 . The rest comprises a maximum of 10% by weight of typical impurity oxides.
Inventors
- 👤 Axel Eschner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C03; C03C; C03C13/00; C03C13/06; C04B30/00; C04B30/02; C04B35/01; C04B35/622; C04B35/62227; C04B35/62231; C04B35/62236; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62665; C04B38/00; D; D01; D01D; D01D5/00; D01D5/08; D01D5/098; D01D5/0985; D01F; D01F9/00; D01F9/08; C03C2213/00; C03C2213/02; C04B2111/00; C04B2111/20; C04B2111/28; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3208; C04B2235/34; C04B2235/3418; C04B2235/44; C04B2235/448; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/526; C04B2235/5264; C04B2235/70; C04B2235/72; D01D5/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
59 words
An inorganic fiber, at least 90% by weight of which comprises 20-50% by weight of CaO and 50-80% by weight of Al 2 O 3 , and up to 10% by weight of which comprises impurities, based on the weight of the fiber, with the proviso that the fiber contain up to 1.5% by weight of SiO 2 .
Claim 2
Dependent Claim
59 words
An inorganic fiber, at least 90% by weight of which comprises 20-50% by weight of CaO and 50-80% by weight of Al 2 O 3 , and up to 10% by weight of which comprises impurities, based on the weight of the fiber, with the proviso that the fiber contain up to 1.5% by weight of SiO 2 .
Claim 3
Dependent Claim
31 words
The inorganic fiber as claimed in claim 1, at least 95% by weight of which comprises 20-50% by weight of CaO and 50-80% by weight of Al 2 O 3 .
Claim 4
Dependent Claim
20 words
The inorganic fiber as claimed in claim 1, wherein at least 60% by weight of the fiber is X-ray amorphous.
Claim 5
Dependent Claim
27 words
The inorganic fiber as claimed in claim 1, wherein the amount of SiO 2 is up to 0.8% by weight based on the weight of the fiber.
Claim 6
Dependent Claim
19 words
The inorganic fiber as claimed in claim 1, wherein the fiber has a diameter of 10 μm or less.
Claim 7
Dependent Claim
17 words
The inorganic fiber as claimed in claim 5, wherein the fiber has a diameter of 1-5 μm.
Claim 8
Dependent Claim
19 words
The inorganic fiber as claimed in claim 1, wherein the fiber has a length of greater than 20 μm.
Claim 9
Dependent Claim
10 words
A fibrous structure comprising the inorganic fiber of claim 1.
Claim 10
Dependent Claim
17 words
The fibrous structure as claimed in claim 8, wherein the structure is a heat insulating fiber mat.
Claim 11
Dependent Claim
11 words
A fiber molding which comprises the inorganic fiber of claim 1.
Claim 12
Dependent Claim
16 words
A seal for a ceramic molding, wherein the seal comprises the inorganic fiber of claim 1.
Claim 13
Dependent Claim
17 words
A joint filler for a ceramic molding, wherein the filler comprises the inorganic fiber of claim 1.
Claim 14
Dependent Claim
13 words
A ceramic or metallic molding reinforced with the inorganic fiber of claim 1.
References Cited (Backward Citations)
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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) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |