US3104943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinnable mullite fibers and their preparation
Assignee: EIDP Inc
•
Filing: 1960-04-25
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Granted: 1963-09-24
•
Expires: 1980-04-25
Abstract
No abstract record available.
Inventors
- 👤 Kenneth L Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6224; C04B35/62245; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A METHOD FOR PREPARING MULLITE IN A FORM SUFFICIENTLY FLEXIBLE TO BE SPUN, WHICH COMPRISES HEATING A MIXTURE CONTAINING SOURCES OF SILICON, OXYGEN, ALUMINUM, AND SULFUR IN AN ATMOSPHERE CONTAINING AT LEAST 1% HYDROGEN AND AT A TEMPERATURE IN THE RANGE OF 800-1200*C., THE RELATIVE PROPORTIONS BY WEIGHT OF SIO2:AL2S3 DERIVED FROM SAID SOURCES VARYING FROM ABOUT 2:1:0.6 TO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |