US3904423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali resistant glass
Assignee: Evanite Fiber Corp
•
Filing: 1973-04-16
•
Granted: 1975-09-09
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Expires: 1993-04-16
Abstract
Abstract Fiber making glass of high alkaline resistance is formed of oxides of Groups II, III and IV elements in ratio to provide modulus of acidity between about 1.1 and 2.2, the glass including oxides of silicon, aluminum, calcium, magnesium, zirconium, boron and zinc or substitutes.
Inventors
- 👤 Bernard M Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:54
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/093; C03C13/00; C03C13/001; C03C13/002; C03C3/062; C03C3/064
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
24 words
GLASS COMPOSITION HAVING A MODULUS OF ACIDITY OF BETWEEN ABOUT 1.1 AND 2.2 AND CONSISTING ESSENTIALLY OF THE FOLLOWING OXIDES, EXPRESSED IN MOLE PERCENTAGES:
Claim 2
Dependent Claim
24 words
GLASS COMPOSITION HAVING A MODULUS OF ACIDITY OF BETWEEN ABOUT 1.1 AND 2.2 AND CONSISTING ESSENTIALLY OF THE FOLLOWING OXIDES, EXPRESSED IN MOLE PERCENTAGES:
Claim 3
Dependent Claim
20 words
A glass composition as set forth in claim 1 wherein the modulus of acidity is between about 1.4 and 1.8.
Claim 4
Dependent Claim
16 words
A glass composition as set forth in claim 1 wherein the modulus of acidity is 1.62.
Claim 5
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 6
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 7
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 8
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 9
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 10
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 11
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 12
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 13
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 14
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 15
Dependent Claim
14 words
A glass composition as set forth in claim 1 consisting essentially, in mole percent:
Claim 16
Dependent Claim
11 words
Glass fibers having properties and composition set forth in claim 1.
References Cited (Backward Citations)
US3783092A
Cited
US3673049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |