US3607189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melting particulate glass batch
Assignee: FMC Corp
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Filing: 1968-12-23
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Granted: 1971-09-21
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Expires: 1988-12-23
Abstract
Abstract An improved process for producing glass designed for television tubes is described comprising adding either barium carbonate or strontium carbonate to a glass batch in the form of hard, prefused particles made by fusing a mixture of said barium carbonate (or strontium carbonate) with at least 20 percent by weight of sodium carbonate and/or potassium carbonate.
Inventors
- 👤 William Manring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:48
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02; C03C1/026
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
16 words
Process of and sodium 1 in which said fused particles contain barium carbonate and sodium carbonate.
Claim 2
Dependent Claim
21 words
Process of claim 2 wherein said barium carbonate and said sodium carbonate are present in a weight ratio of about 1:1.
Claim 3
Dependent Claim
14 words
Process of claim 1 wherein said fused particles contain strontium carbonate and sodium carbonate.
Claim 4
Dependent Claim
20 words
Process of claim 4 wherein said strontium carbonate and said sodium carbonate are in a weight ratio of about 1:1.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |