US2730475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming felted silica fibers
Assignee: BP Chemicals Hitco Inc
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Filing: 1953-02-27
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Granted: 1956-01-10
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Expires: 1973-02-27
Abstract
No abstract record available.
Inventors
- 👤 Parker Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:13
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/66; C03C25/68; C03C13/00; C03C13/005; D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H5/00; D21H5/12; D21H5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A HEAT SHRUNK BATT OF SILICA FIBERS, EACH OF SAID FIBERS BEING OF LENGTH BETWEEN ABOUT 1/4" AND 2", SAID FIBERS BEING SUBSTANTIALLY ANHYDROUS AND SUBSTANTIALLY FREE OF CHLORIDES AND CONTAINING FROM ABOUT 90 TO 99.9% OF SILICA, AND THE REMAINDER OF SAID FIBERS CONSISTING SUBSTANTIALLY OF GLASS-FORMING, NON-SILICEOUS METALLIC OXIDES, SAID FIBERS AND SAID BATT BEING HEAT SHRUNK.
Claim 2
Dependent Claim
59 words
A HEAT SHRUNK BATT OF SILICA FIBERS, EACH OF SAID FIBERS BEING OF LENGTH BETWEEN ABOUT 1/4" AND 2", SAID FIBERS BEING SUBSTANTIALLY ANHYDROUS AND SUBSTANTIALLY FREE OF CHLORIDES AND CONTAINING FROM ABOUT 90 TO 99.9% OF SILICA, AND THE REMAINDER OF SAID FIBERS CONSISTING SUBSTANTIALLY OF GLASS-FORMING, NON-SILICEOUS METALLIC OXIDES, SAID FIBERS AND SAID BATT BEING HEAT SHRUNK.
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) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |