US4650775A
Expired / Lapsed
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Thermally bonded fibrous product
Assignee: Thermal Ceramics Inc
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Filing: 1986-04-29
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Granted: 1987-03-17
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Expires: 2006-04-29
Abstract
Abstract A thermally bonded fibrous product is composed of a sintered blend of aluminosilicate fibers, silica powder and boron nitride powder.
Inventors
- 👤 Charles A. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:08
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/691
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
40 words
A thermally bonded fibrous product having high thermal insulating value, high modulus of rupture and low density comprising a blend of aluminosilicate fibers, silica powder and boron nitride powder formed by sintering at a temperature of at least 2350° F.
Claim 2
Dependent Claim
40 words
A thermally bonded fibrous product having high thermal insulating value, high modulus of rupture and low density comprising a blend of aluminosilicate fibers, silica powder and boron nitride powder formed by sintering at a temperature of at least 2350° F.
Claim 3
Dependent Claim
30 words
A thermally bonded fibrous product as set forth in claim 1 wherein said blend, by weight, consists essentially of 75% aluminosilicate fiber, 20% silica powder and 5% boron nitride powder.
Claim 4
Dependent Claim
35 words
A thermally bonded fibrous product as set forth in claim 2 wherein the silica powder consists essentially of -325 mesh silica powder and the boron nitride powder consists essentially of -325 mesh boron nitride powder.
Claim 5
Dependent Claim
30 words
A thermally bonded fibrous product as set forth in claim 3 wherein said blend, by weight, consists essentially of 76.2% aluminosilicate fiber, 19% silica powder and 4.8% boron nitride powder.
Claim 6
Dependent Claim
23 words
A thermally bonded fibrous product as set forth in claim 2 wherein the siica powder consists essentially of 12 millimicron amorphous fumed silica.
Claim 7
Dependent Claim
31 words
A thermally bonded fibrous product as set forth in claim 5 wherein said blend, by weight, consists essentially of 89.5% aluminosilicate fiber, 7.2% amorphous fumed silica, and 3.3.% boron nitride powder.
Claim 8
Dependent Claim
18 words
A thermally bonded fibrous product as set forth in claim 6 wherein the sintering temperature is 2500° F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |