US4084977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass and refractory fibre materials and method for making same
Assignee: TBA Industrial Products Ltd
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Filing: 1974-10-01
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Granted: 1978-04-18
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Expires: 1994-10-01
Abstract
Abstract A glass fibre product consists of less than 80% by weight SiO 2 from 20 to 25% by weight of TiO 2 and not more than about 0.1% by weight of alkali metal oxide, and is made by leaching with acid a glass fibre composition consisting of from 20 to 40% by weight of alkali metal oxide, from more than 12 up to 20% TiO 2 and the balance to 100% of SiO 2 and having a silica:titania ratio within a selected range.
Inventors
- 👤 Clive M. Freedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:14
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/005; C03C25/00; C03C25/66; C03C25/68
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
34 words
A glass fibre product consisting of less than 80% by weight SiO 2 , from 20 to 25% by weight TiO 2 and not more than about 0.1% by weight of alkali metal oxide.
Claim 2
Dependent Claim
34 words
A glass fibre product consisting of less than 80% by weight SiO 2 , from 20 to 25% by weight TiO 2 and not more than about 0.1% by weight of alkali metal oxide.
Claim 3
Dependent Claim
18 words
A glass fibre product according to claim 1, comprising from 20 to about 23% of TiO 2 .
Claim 4
Independent Claim
146 words
A method of manufacturing a glass fibre product consisting of less than 80% by weight of SiO 2 , from 20 to 25% by weight TiO 2 and not more than about 0.1% by weight of alkali metal oxide, said method comprising leaching with an acid a glass composition in the form of fibres, which composition prior to said leaching consists of from 20 to 40% by weight of an alkali metal oxide, from more than 12% up to 20% of TiO 2 and the balance to 100% of SiO 2 , and wherein the silica:titania ratio is within the range from not greater than 3.4:1 for an alkali metal content of up to 25% to not greater than 4.0:1 for a alkali metal content of from 25% to 40%, the resulting product exhibiting improved strength properties and minimal shrinkage as compared to wholly siliceous products.
Claim 5
Independent Claim
146 words
A method of manufacturing a glass fibre product consisting of less than 80% by weight of SiO 2 , from 20 to 25% by weight TiO 2 and not more than about 0.1% by weight of alkali metal oxide, said method comprising leaching with an acid a glass composition in the form of fibres, which composition prior to said leaching consists of from 20 to 40% by weight of an alkali metal oxide, from more than 12% up to 20% of TiO 2 and the balance to 100% of SiO 2 , and wherein the silica:titania ratio is within the range from not greater than 3.4:1 for an alkali metal content of up to 25% to not greater than 4.0:1 for a alkali metal content of from 25% to 40%, the resulting product exhibiting improved strength properties and minimal shrinkage as compared to wholly siliceous products.
Claim 6
Dependent Claim
21 words
A method according to claim 3, wherein the fibres are leached at a pH within the range from 2.4 to 0.3.
Claim 7
Dependent Claim
19 words
A method according to claim 3, wherein the leached fibres are shrink stabilised by subjecting them to elevated temperature.
Claim 8
Dependent Claim
33 words
A method according to claim 3, wherein a property of the leached fibre selected from tensile strength and tensile modulus, is further improved by subjecting the leached fibre to treatment with an alkali.
Claim 9
Dependent Claim
25 words
A method according to claim 3, wherein said acid leaching step is contained until the alkali metal content of the glass product is substantially zero.
Claim 10
Dependent Claim
24 words
A method according to claim 5, wherein the shrink stabilization is conducted at a temperature in the range of from 900° to 1100° C.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |