US2624658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming silica fibers
Assignee: H I THOMPSON Co
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Filing: 1949-08-08
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Granted: 1953-01-06
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Expires: 1969-08-08
Abstract
No abstract record available.
Inventors
- 👤 Parker Leon
- 👤 Zack Bonnie Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:06
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/66; C03C25/68; C03C13/00; C03C13/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR LEACHING GLASS FIBERS, WHICH COMPRISES LEACHING GLASS FIBERS WITH AN ACID SOLUTION AT A LEACHING TEMPERATURE TO REMOVE THE NONSILICEOUS METAL OXIDES FROM THE GLASS FIBERS AND TO CONVERT VITREOUS SILICA INTO SODIUM CARBONATE SOLUBLE SILICA, CONTINUING THE LEACHING UNTIL THE CONTENT OF SODIUM CARBONATE SOLUBLE SILICA IN THE LEACHED FIBERS, WHEN CALCULATED ON A VOLATILE FREE BASIS, IS IN EXCESS OF 30% AND LESS THAN 89%, INTERRUPTING THE LEACHING OF SAID FIBERS, AND WASHING SAID LEACHED FIBERS.
Claim 2
Dependent Claim
81 words
A PROCESS FOR LEACHING GLASS FIBERS, WHICH COMPRISES LEACHING GLASS FIBERS WITH AN ACID SOLUTION AT A LEACHING TEMPERATURE TO REMOVE THE NONSILICEOUS METAL OXIDES FROM THE GLASS FIBERS AND TO CONVERT VITREOUS SILICA INTO SODIUM CARBONATE SOLUBLE SILICA, CONTINUING THE LEACHING UNTIL THE CONTENT OF SODIUM CARBONATE SOLUBLE SILICA IN THE LEACHED FIBERS, WHEN CALCULATED ON A VOLATILE FREE BASIS, IS IN EXCESS OF 30% AND LESS THAN 89%, INTERRUPTING THE LEACHING OF SAID FIBERS, AND WASHING SAID LEACHED FIBERS.
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) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |