US4363878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali- and heat-resistant inorganic fiber
Assignee: Nitto Boseki Co Ltd
•
Filing: 1981-03-09
•
Granted: 1982-12-14
•
Expires: 2001-03-09
Abstract
Abstract The inorganic fiber of this invention comprising as major constituents -% by weight -SiO2 40-50 -CaO 0-10 -MgO 15-25 -Fe2O3 + FeO 0-10 -Al2O3 5-15 -MnO 2-15 - (provided that the total amount of CaO, Fe2O3, FeO and MnO is about 20% by weight) is excellent in alkali- and heat-resistances and is useful as a replacement of asbestos in asbestos-cement boards. Titanium oxide (TiO2) is contained in natural rocks or slags to be used for the meltable material as an impurity in the amount of about 2% by weight.
Inventors
- 👤 Osamu Yamamoto
- 👤 Keishin Takehara
- 👤 Yutaka Yasiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:39
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
An alkali- and heat-resistant inorganic fiber consisting essentially of ______________________________________
% by weight
______________________________________
SiO.sub.2 40-50
CaO 0-10
MgO 15-25
Fe.sub.2 O.sub.3 + FeO
0-10
Al.sub.2 O.sub.3
5-15
MnO 2-15
______________________________________ provided that the total amount of CaO, Fe 2 O 3 , FeO and MnO is about 20% by weight and having an optional fiber-forming temperature of about 1410°-1460° C.
Claim 2
Dependent Claim
61 words
An alkali- and heat-resistant inorganic fiber consisting essentially of ______________________________________
% by weight
______________________________________
SiO.sub.2 40-50
CaO 0-10
MgO 15-25
Fe.sub.2 O.sub.3 + FeO
0-10
Al.sub.2 O.sub.3
5-15
MnO 2-15
______________________________________ provided that the total amount of CaO, Fe 2 O 3 , FeO and MnO is about 20% by weight and having an optional fiber-forming temperature of about 1410°-1460° C.
Claim 3
Dependent Claim
65 words
An alkali- and heat-resistant inorganic fiber consisting essentially of: ______________________________________
% by weight
______________________________________
SiO.sub.2 40-50
CaO 0-10
MgO 15-25
Fe.sub.2 O.sub.3 + FeO
0-10
Al.sub.2 O.sub.3
5-15
MnO 2-15
______________________________________ provided that the total amount of CaO, Fe 2 O 3 , FeO and MnO is about 20% by weight and having a melt viscosity at 1500° C. of about 3.2 poises or less.
Claim 4
Dependent Claim
65 words
An alkali- and heat-resistant inorganic fiber consisting essentially of: ______________________________________
% by weight
______________________________________
SiO.sub.2 40-50
CaO 0-10
MgO 15-25
Fe.sub.2 O.sub.3 + FeO
0-10
Al.sub.2 O.sub.3
5-15
MnO 2-15
______________________________________ provided that the total amount of CaO, Fe 2 O 3 , FeO and MnO is about 20% by weight and having a melt viscosity at 1500° C. of about 3.2 poises or less.
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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |