Patent US4391915A successfully refreshed from Google Patents.
US4391915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision pressed optical components made of glass and glass suitable therefor
Assignee: US Philips Corp
•
Filing: 1981-12-07
•
Granted: 1983-07-05
•
Expires: 2001-12-07
Abstract
Abstract Optical components can be pressed with such a precision that grinding and polishing of the formed components is not necessary, from glasses containing 45-55 wt. % P 2 O 5 , 3.5-9 wt. % Al 2 O 3 , 5-20 wt. % K 2 O, 0-3 wt. % Li 2 O, 8-15% BaO, 4.5-9 wt. % ZnO, 0-6 wt. % MgO, 0-18 wt. % PbO, 0-1 wt. % SiO 2 , 0-3 wt. % B 2 O 3 , 0-2 wt. % TiO 2 .
Inventors
- 👤 Gertraud A. A. Meden-Piesslinger
- 👤 Johannes H. P. Van de Heuvel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:27
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/12; C03C3/16; C03C3/17; C03C3/19; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
Precision pressed optical components made of glass, which components are pressed from a glass containing phosphorus pentoxide (P 2 O 5 ), one or more alkali metal oxides and one or more alkaline earth oxides, characterized in that the glass consists of in a percentage by weight: P 2 O 5 : 45-55 Al 2 O 3 : 3.5-9 K 2 O: 5-20 Li 2 O: 0-3 BaO: 8-15 ZnO: 4.5-9 MgO: 0-6 PbO: 0-18 SiO 2 : 0-1 B 2 O 3 : 0-3 TiO 2 : 0-2.
Claim 2
Dependent Claim
89 words
Precision pressed optical components made of glass, which components are pressed from a glass containing phosphorus pentoxide (P 2 O 5 ), one or more alkali metal oxides and one or more alkaline earth oxides, characterized in that the glass consists of in a percentage by weight: P 2 O 5 : 45-55 Al 2 O 3 : 3.5-9 K 2 O: 5-20 Li 2 O: 0-3 BaO: 8-15 ZnO: 4.5-9 MgO: 0-6 PbO: 0-18 SiO 2 : 0-1 B 2 O 3 : 0-3 TiO 2 : 0-2.
Claim 3
Dependent Claim
64 words
Precision pressed glass optical components as claimed in claim 1, characterized in that the glass consists of in a percentage by weight: P 2 O 5 : 51-53 Al 2 O 3 : 4.5-5.5 K 2 O: 10.5-12 Li 2 O: 1.5-2.5 BaO: 10-11.5 ZnO: 4.5-5.5 MgO: 1.5-2.5 PbO: 8-9.5 SiO 2 : 0-1 B 2 O 3 : 2-3 TiO 2 : 0-2.
Claim 4
Dependent Claim
72 words
A glass containing phosphorus pentoxide, one or more alkali metal oxides and one or more alkaline earth oxides, characterized in that the glass consists of in a percentage by weight: P 2 O 5 : 45-55 Al 2 O 3 : 3.5-9 K 2 O: 5-20 Li 2 O: 0-3 BaO: 8-15 ZnO: 4.5-9 MgO: 0-6 PbO: 0-18 SiO 2 : 0-1 B 2 O 3 : 0-3 TiO 2 : 0-2.
Claim 5
Dependent Claim
72 words
A glass containing phosphorus pentoxide, one or more alkali metal oxides and one or more alkaline earth oxides, characterized in that the glass consists of in a percentage by weight: P 2 O 5 : 45-55 Al 2 O 3 : 3.5-9 K 2 O: 5-20 Li 2 O: 0-3 BaO: 8-15 ZnO: 4.5-9 MgO: 0-6 PbO: 0-18 SiO 2 : 0-1 B 2 O 3 : 0-3 TiO 2 : 0-2.
Claim 6
Dependent Claim
61 words
A glass as claimed in claim 3, characterized in that the glass consists of in a percentage by weight: P 2 O 5 : 51-53 Al 2 O 3 : 4.5-5.5 K 2 O: 10.5-12 Li 2 O: 1.5-2.5 BaO: 10-11.5 ZnO: 4.5-5.5 MgO: 1.5-2.5 PbO: 8-9.5 SiO 2 : 0-1 B 2 O 3 : 2-3 TiO 2 : 0-2.
References Cited (Backward Citations)
US3481749A
Cited
US3281254A
Cited
US3328181A
Cited
US3451829A
Cited
US3979322A
Cited
US4110245A
Cited
US4108673A
Cited
US4303298A
Cited
EP0019342A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |