Patent US4391622A successfully refreshed from Google Patents.
US4391622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the precision/manufacture of glass articles
Assignee: USPHILIPS Corp A CORP OF DE
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Filing: 1981-05-18
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Granted: 1983-07-05
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Expires: 2001-05-18
Abstract
Abstract By using special dies, lenses from glass can be manufactured with great precision. Such dies are manufactured from quartz glass. Quartz glass can be worked with the required shape accuracy and the required smoothness, for example, by a polishing treatment succeeded by sputtering.
Inventors
- 👤 Cornelis L. Alting
- 👤 Rudolf Brehm
- 👤 Jan Haisma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:28
CPC Classifications
C; C03; C03B; C03B11/00; C03B11/06; C03B11/08; C03B11/084; C03B2215/00; C03B2215/02; C03B2215/05; C03B2215/76
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
In a method for precision manufacture of glass articles molded in a mold or hot-pressed in a die, the improvement comprises the step of using a mold or die having at least contact surfaces made from quartz glass or an amorphous SiO 2 with upto 7.5% by weight of TiO 2 with a coefficient of linear expansion of at most 60×10 -8 per °C., wherein said glass articles have a substantially higher coefficient of linear expansion.
Claim 2
Dependent Claim
76 words
In a method for precision manufacture of glass articles molded in a mold or hot-pressed in a die, the improvement comprises the step of using a mold or die having at least contact surfaces made from quartz glass or an amorphous SiO 2 with upto 7.5% by weight of TiO 2 with a coefficient of linear expansion of at most 60×10 -8 per °C., wherein said glass articles have a substantially higher coefficient of linear expansion.
Claim 3
Dependent Claim
30 words
A method according to claim 1, wherein pure quartz glass having a coefficient of linear expansion of at most 60×10 -8 per °C. is used to form said contact surfaces.
Claim 4
Dependent Claim
45 words
A method according to claim 1, wherein glass ceramic being amorphous SiO 2 with upto 7.5% by weight of TiO 2 and having a coefficient of linear expansion ranging from 0 per °C. to 10×10 -8 per °C. is used to form said contact surfaces.
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) | 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 |