Patent US3620787A successfully refreshed from Google Patents.
US3620787A
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Glass composition
Assignee: Owens Corning
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Filing: 1968-10-02
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Granted: 1971-11-16
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Expires: 1988-10-02
Abstract
Abstract A glass composition comprising silica, alumina, beryllia, and magnesia and fibers formed therefrom on conventional production equipment, exhibit improved modulus, tensile strength, hightemperature resistance and lower density over formerly available textile filaments, and show particular utility in reinforcement of plastic laminates where high strength-to-weight ratios are desired and imperative.
Inventors
- 👤 Robert M Mcmarlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:17
CPC Classifications
C; C03; C03C; C03C13/00; C03C11/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
26 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 67.3 Al2O3 12.0 BeO 16.8 MgO 3.9
Claim 2
Dependent Claim
26 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 65.0 Al2O3 17.5 BeO 15.8 MgO 11.7
Claim 3
Dependent Claim
26 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 60.0 Al2O3 17.5 BeO 15.0 MgO 7.5
Claim 4
Dependent Claim
28 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 not = 70.0 Al2O3 15.0 BeO 7.5 MgO 7.5
Claim 5
Dependent Claim
26 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 80.0 Al2O3 10.0 BeO 5.0 MgO 5.0
Claim 6
Dependent Claim
25 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 70.0 Al2O315.0 BeO 5.0 MgO 10.0
Claim 7
Dependent Claim
26 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 70.0 Al2O3 15.0 BeO 2.5 MgO 12.5
Claim 8
Dependent Claim
26 words
A glass composition as described in claim 1 wherein the mole percentages of each constituent are as follows: SiO2 68.6 Al2O3 12.3 BeO 17.1 MgO 2.0
Claim 9
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 1.
Claim 10
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 2.
Claim 11
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 3.
Claim 12
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 4.
Claim 13
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 5.
Claim 14
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 6.
Claim 15
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 7.
Claim 16
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 8.
Claim 17
Dependent Claim
10 words
Glass fibers formed from the glass composition of claim 9.
Claim 18
Dependent Claim
40 words
A multifilament strand of glass fibers formed from a glass composition wherein the range of mole percentages of each constituent consists essentially of: a. 55.0-82.0 of SiO2, b. 8.0-18.0 of Al2O3, c. 1.0-25.0 of BeO, and d. 1.0-15.0 of MgO.
Claim 19
Dependent Claim
38 words
A high temperature resistant fabric made of interwoven yarns, said yarns consisting essentially of glass fibers having high tensile strength, high modulus and low density comprising in mole percentages 55.0-82.0% SiO2, 8.0-18.0% Al2O3, 1.0-25.0% BeO and 1.0-15.0% MgO.
Claim 20
Dependent Claim
30 words
A plastic matrix reinforced by glass fibers distributed through the matrix wherein said glass fibers consist essentially of in mole percentages 55.0-82.0% SiO2, 8.0-18.0% Al2O3, 1.0-25.0% BeO and 1.0-15.0% MgO.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |