US3073770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mullite synthesis
Assignee: AT&T Inc
•
Filing: 1961-04-24
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Granted: 1963-01-15
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Expires: 1981-04-24
Abstract
No abstract record available.
Inventors
- 👤 William R Sinclair
- 👤 John C Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:29
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; C01B33/26; C01B33/40; C01B33/46; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/185; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; H01C; H01C17/00; H01C17/06; H01C17/075; H01C17/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A METHOD FOR THE PREPARATION OF MULLITE OF NEEDLE CRYSTALLINE HABIT WHICH COMPRISES THE STEPS OF SPUTTERING 04A SILICON-ALUMINUM ALLOY UPON A SUBSTRATE IN THE PRESENCE OF OXYGEN AT A PRESSURE WITHIN THE RANGE OF 10 TO 50 MICRONS OF MERCURY AND A VOLTAGE OF AT LEAST 30 VOLTS, THEREBY FORMING AN OXIDIZED FILM HAVING A COMPOSITION WITHIN THE RANGE OF 72-78% AL2O3, REMAINDER SIO2 OF THE SILICON-ALUMINUM ALLOY AND, SUBSEQUENTLY HEATING THE SAID OXIDIZED FILM AT A TEMPERATURE WITHIN THE RANGE OF 1000 TO 1500* C. FOR A TIME PERIOD OF APPROXIMATELY 1 TO 2 HOURS THEREBY CONVERTING THE OXIDIZED FILM INTO MULLITE OF NEEDLE CRYSTALLINE HABIT.
Claim 2
Independent Claim
108 words
A METHOD FOR THE PREPARATION OF MULLITE OF NEEDLE CRYSTALLINE HABIT WHICH COMPRISES THE STEPS OF SPUTTERING 04A SILICON-ALUMINUM ALLOY UPON A SUBSTRATE IN THE PRESENCE OF OXYGEN AT A PRESSURE WITHIN THE RANGE OF 10 TO 50 MICRONS OF MERCURY AND A VOLTAGE OF AT LEAST 30 VOLTS, THEREBY FORMING AN OXIDIZED FILM HAVING A COMPOSITION WITHIN THE RANGE OF 72-78% AL2O3, REMAINDER SIO2 OF THE SILICON-ALUMINUM ALLOY AND, SUBSEQUENTLY HEATING THE SAID OXIDIZED FILM AT A TEMPERATURE WITHIN THE RANGE OF 1000 TO 1500* C. FOR A TIME PERIOD OF APPROXIMATELY 1 TO 2 HOURS THEREBY CONVERTING THE OXIDIZED FILM INTO MULLITE OF NEEDLE CRYSTALLINE HABIT.
References Cited (Backward Citations)
US2636855A
Cited
US2641044A
Cited
US2678282A
Cited
US2825687A
Cited
US2754259A
Cited
US2761945A
Cited
US2874077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |