Patent US4455384A successfully refreshed from Google Patents.
US4455384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically durable nitrogen containing phosphate glasses useful for sealing to metals
Assignee: United States, AS REPRESENTED BY UNITED STATES DEPARTMET OF ENERGY
•
Filing: 1982-12-08
•
Granted: 1984-06-19
•
Expires: 2002-12-08
Abstract
Abstract The chemical durability of alkali phosphate glasses is improved by incorporation of up to 23 weight percent of nitrogen. A typical phosphate glass contains: 10 to 60 mole % of Li2O, Na2O or K2O; 5-40 mole % of BaO or CAO; 0-1 to 10 mole % of Al2O3; and 40-70 mole % of P2O5. Nitrides, such as AlN, are the favored additives.
Inventors
- 👤 Delbert E. Day
- 👤 James A. Wilder, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:58
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/21; C03C27/00; C03C27/02; C03C3/17
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
An alkali phosphate glass comprising 10-60 mole percent Li 2 O, Na 2 O or K 2 O, 5-40 mole percent BaO or CaO, 0.1-10 mole percent Al 2 O 3 , and 40-70 mole percent P 2 O 5 , and being of enhanced chemical durability due to said glass further comprising about 0.15 to 23 wt percent of nitrogen added in the form of a metal nitride.
Claim 2
Dependent Claim
69 words
An alkali phosphate glass comprising 10-60 mole percent Li 2 O, Na 2 O or K 2 O, 5-40 mole percent BaO or CaO, 0.1-10 mole percent Al 2 O 3 , and 40-70 mole percent P 2 O 5 , and being of enhanced chemical durability due to said glass further comprising about 0.15 to 23 wt percent of nitrogen added in the form of a metal nitride.
Claim 3
Dependent Claim
77 words
The phosphate glass of claim 1 comprising up to 0.1 mole percent Pt; up to 10 mole percent TiO 2 ZrO 2 , Y 2 O 2 , La 2 O 3 or Ta 2 O 5 ; up to five mole percent CoO, CuO, SnO, Ag 2 O, Cr 2 O 3 or NiO; or up to ten mole percent PbO, WO 3 , B 2 O 3 , SiO 2 , GeO 2 or ZnO.
Claim 4
Dependent Claim
15 words
A phosphate glass of claim 1 comprising about 0.15 to 2.0 wt. % of nitrogen.
Claim 5
Dependent Claim
15 words
A phosphate glass of claim 3 comprising about 0.17 to 0.7 wt. % of nitrogen.
Claim 6
Dependent Claim
16 words
A phosphate glass of claim 1 wherein the nitrogen is added in the form of AlN.
Claim 7
Dependent Claim
16 words
A phosphate glass of claim 3 wherein the nitrogen is added in the form of AlN.
Claim 8
Dependent Claim
16 words
A phosphate glass of claim 4 wherein the nitrogen is added in the form of AlN.
Claim 9
Dependent Claim
24 words
A phosphate glass of claim 1 wherein the nitrogen is added in the form of Si 3 N 4 , YN, LaN or BN.
Claim 10
Dependent Claim
23 words
A phosphate glass of claim 1 wherein the nitrogen is added in the form of Ca 3 N 2 or Li 3 N.
Claim 11
Independent Claim
70 words
A method of improving the chemical durability of an alkali phosphate glass comprising 10-60 mole percent Li 2 O, Na 2 O or K 2 O, 5-40 mole percent BaO or CaO, 0.1-10 mole percent Al 2 O 3 , and 40-70 mole percent P 2 O 5 , by incorporating therein 0.15 to 23 wt percent nitrogen in the form of a metal nitride added to the molten glass.
Claim 12
Independent Claim
70 words
A method of improving the chemical durability of an alkali phosphate glass comprising 10-60 mole percent Li 2 O, Na 2 O or K 2 O, 5-40 mole percent BaO or CaO, 0.1-10 mole percent Al 2 O 3 , and 40-70 mole percent P 2 O 5 , by incorporating therein 0.15 to 23 wt percent nitrogen in the form of a metal nitride added to the molten glass.
Claim 13
Dependent Claim
18 words
In a glass to metal seal, the improvement wherein the glass is a phosphate glass of claim 1.
References Cited (Backward Citations)
US3856494A
Cited
US3709723A
Cited
US3930873A
Cited
US4070198A
Cited
US4123248A
Cited
US4202700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |