Patent US2625626A successfully refreshed from Google Patents.
Patent US6621312B2 successfully refreshed from Google Patents.
Patent US4312952A successfully refreshed from Google Patents.
US4312952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibre glass composition
Assignee: Partek Oy AB
•
Filing: 1980-04-11
•
Granted: 1982-01-26
•
Expires: 2000-04-11
Abstract
Abstract A fibre glass composition which is characterized in that it consists of -% by weight -SiO2 55-65 -Al2O3 1-2 -CaO 6-9.5 -MgO 1-4.5 -Na2O 13-17 -K2O 0-2 -B2O3 1-7 -BaO 0-3 -Li2O 0-1 -Fe2O3 traces -ZnO 0.5-6 -
Inventors
- 👤 Vlastimil Carbol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:22
CPC Classifications
C; C03; C03C; C03C13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A fibre glass composition characterized in that it consists of ______________________________________
by weight
______________________________________
SiO.sub.2
58-62
Al.sub.2 O.sub.3
1-2
CaO 8-9.5
MgO 2.5-3.5
Na.sub.2 O
15-17
K.sub.2 O
0-1
B.sub.2 O.sub.3
5-7
BaO --
Li.sub.2 O
0.1-0.4
Fe.sub.2 O.sub.3
traces
ZnO 1.5-3.5.
______________________________________
Claim 2
Dependent Claim
43 words
A fibre glass composition characterized in that it consists of ______________________________________
by weight
______________________________________
SiO.sub.2
58-62
Al.sub.2 O.sub.3
1-2
CaO 8-9.5
MgO 2.5-3.5
Na.sub.2 O
15-17
K.sub.2 O
0-1
B.sub.2 O.sub.3
5-7
BaO --
Li.sub.2 O
0.1-0.4
Fe.sub.2 O.sub.3
traces
ZnO 1.5-3.5.
______________________________________
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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |