Patent US2947642A successfully refreshed from Google Patents.
US2947642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
glowacki
Assignee: —
•
Filing: —
•
Granted: 1960-08-02
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Expires: 1977-08-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:52
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/44; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3217; C04B2235/3222; C04B2235/34; C04B2235/3418; C04B2235/70; C04B2235/72; C04B2235/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A CERAMIC COMPOSED ESENTIALLY OF 85 TO 92 PERCENT ALUMINUM OXIDE, 4 TO 7 PERCENT MAGNESIUM OXIDE: 4 TO 7 PERCENT CALCIUM SILICATE, 0 TO 3 PERCENT BERYLLIUM OXIDE, AND 1 TO 3 PERCENT PENTACALCIUM TRIALUMINATE.
Claim 2
Dependent Claim
36 words
A CERAMIC COMPOSED ESENTIALLY OF 85 TO 92 PERCENT ALUMINUM OXIDE, 4 TO 7 PERCENT MAGNESIUM OXIDE: 4 TO 7 PERCENT CALCIUM SILICATE, 0 TO 3 PERCENT BERYLLIUM OXIDE, AND 1 TO 3 PERCENT PENTACALCIUM TRIALUMINATE.
References Cited (Backward Citations)
US2680692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |