US4205992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali resistant, synthetic, mineral fibres
Assignee: Rockwool AS
•
Filing: 1978-12-28
•
Granted: 1980-06-03
•
Expires: 1998-12-28
Abstract
Abstract Alkali resistant, synthetic, mineral fibres having the following composition on weight basis: SiO 2 : 42-50%, Al 2 O 3 : 8-13%, Iron oxides (calculated as FeO): 6-11%, CaO: 4-11%, MgO: 17-22%, TiO 2 : 0.5-3% and alkali metal oxides: 0.5-3.5%.
Inventors
- 👤 Gurli Mogensen
- 👤 Leif M. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:37
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03C13/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
50 words
Alkali resistant, synthetic, mineral fibres, having a composition consisting essentially of: ______________________________________
SiO.sub.2 : 42-50% by weight
Al.sub.2 O.sub.3 :
8-13% --
Iron oxides
(calculated as
FeO) 6-11% --
CaO: 4-11% --
MgO: 17-22% --
TiO.sub.2 : 0.5-3% --
R.sub.2 O: 0.5-3.5% --
______________________________________ wherein R is an alkali metal.
Claim 2
Dependent Claim
50 words
Alkali resistant, synthetic, mineral fibres, having a composition consisting essentially of: ______________________________________
SiO.sub.2 : 42-50% by weight
Al.sub.2 O.sub.3 :
8-13% --
Iron oxides
(calculated as
FeO) 6-11% --
CaO: 4-11% --
MgO: 17-22% --
TiO.sub.2 : 0.5-3% --
R.sub.2 O: 0.5-3.5% --
______________________________________ wherein R is an alkali metal.
Claim 3
Dependent Claim
66 words
A fibre reinforced cementitious product which comprises a cementitious matrix and reinforcing fibres therein, said fibre reinforcement comprising alkali resistant, synthetic, mineral fibres having a composition consisting essentially of: ______________________________________
SiO.sub.2 42-50% by weight
Al.sub.2 O.sub.3
8-13% --
Iron oxides
calculated as
FeO): 6-11% --
CaO: 4-11% --
MgO 17-22% --
TiO.sub.2 0.5-3% --
R.sub.2 O 0.5-[3,5] 3.5%
--
______________________________________ wherein R is an alkali metal.
Claim 4
Dependent Claim
66 words
A fibre reinforced cementitious product which comprises a cementitious matrix and reinforcing fibres therein, said fibre reinforcement comprising alkali resistant, synthetic, mineral fibres having a composition consisting essentially of: ______________________________________
SiO.sub.2 42-50% by weight
Al.sub.2 O.sub.3
8-13% --
Iron oxides
calculated as
FeO): 6-11% --
CaO: 4-11% --
MgO 17-22% --
TiO.sub.2 0.5-3% --
R.sub.2 O 0.5-[3,5] 3.5%
--
______________________________________ wherein R is an alkali metal.
Claim 5
Dependent Claim
24 words
A fibre reinforced cementitious product as defined in claim 2, wherein said mineral fibres have an average diameter of between 3 and 15 μm.
Claim 6
Dependent Claim
18 words
A fibre reinforced cementitious product as defined in claim 2, wherein said cementitious matrix consists of Portland cement.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |