US3615767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass manufacture employing sodium sulfite
Assignee: FMC Corp
•
Filing: 1970-01-20
•
Granted: 1971-10-26
•
Expires: 1990-01-20
Abstract
Abstract Process of melting a glass batch in order to reduce the number and size of seeds which are present in the final glass product by adding a minor but effective amount, on the order of 0.015 to 1.8 percent by weight, of sodium sulfite to the glass batch charged to a glass furnace.
Inventors
- 👤 Alfred R Conroy Jr
- 👤 William C Bauer
- 👤 David D Billings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:53
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/004
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
23 words
Process of claim 1 wherein said sodium sulfite is added in amounts of 0.4 to 0.8 percent by weight of said glass batch.
Claim 2
Dependent Claim
25 words
Process of claim 1 wherein the principal ingredients of said glass batch consist essentially of soda, lime and silica and said glass product is colorless.
Claim 3
Dependent Claim
28 words
Process of claim 1 wherein sodium sulfate is added along with said sodium sulfite in effective amounts up to about 0.6 percent by weight of said glass batch.
References Cited (Backward Citations)
US26328A
Cited
US1488914A
Cited
US2113195A
Cited
US2224791A
Cited
US2220750A
Cited
US2366473A
Cited
US2481151A
Cited
GB643438A
Cited
US3375095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |