US3404015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low thermal expansion glasses
Assignee: Corning Glass Works
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Filing: 1965-04-28
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Granted: 1968-10-01
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Expires: 1985-04-28
Abstract
No abstract record available.
Inventors
- 👤 Jr William H Dumbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:14
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/083; C03C3/085; C03C3/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A LOW THERMAL EXPANSION GLASS COMPOSITION, HAVING A MAXIMUM COEFFICIENT OF THERMAL EXPANSION OF ABOUT 30X10-7 PER DEGREE C., CONSISTING ESSENTIALLY ON THE OXIDE BASIS OF MAGNESIUM OXIDE 6-12 MOLE PERCENT, ALUMINUM OXIDE 8-18 MOLE PERCENT, SILICA 64-70 MOLE PERCENT, ALKALI METAL OXIDE 0.5-3 MOLE PERCENT AND ANTIMONY TRIOXIDE OXIDE 1-3 MOLE PERCENT.
Claim 2
Dependent Claim
53 words
A LOW THERMAL EXPANSION GLASS COMPOSITION, HAVING A MAXIMUM COEFFICIENT OF THERMAL EXPANSION OF ABOUT 30X10-7 PER DEGREE C., CONSISTING ESSENTIALLY ON THE OXIDE BASIS OF MAGNESIUM OXIDE 6-12 MOLE PERCENT, ALUMINUM OXIDE 8-18 MOLE PERCENT, SILICA 64-70 MOLE PERCENT, ALKALI METAL OXIDE 0.5-3 MOLE PERCENT AND ANTIMONY TRIOXIDE OXIDE 1-3 MOLE PERCENT.
References Cited (Backward Citations)
US3282711A
Cited
US3275493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |