Patent US2772176A successfully refreshed from Google Patents.
US2772176A
Expired / Lapsed
US
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Stopper heads
Assignee: Electro Refractories and Abrasives Corp
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Filing: 1953-03-04
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Granted: 1956-11-27
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Expires: 1973-03-04
Abstract
No abstract record available.
Inventors
- 👤 Carl F Leitten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/66; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A RAW MIX FOR THE MANUFACTURE OF STOPPER HEADS, SAID MIX CONSISTING OF FROM 15 TO 50% BY WEIGHT OF A PLASTIC REFRACTORY CLAY, 15 TO 50% BY WEIGHT OF REFRACTORY CLAY GROG AND FROM 12 TO 20% BY WEIGHT OF FLAKE GRAPHITE AND COMPRISING FROM 12 TO 20% BY WEIGHT OF FUSED SILICA.
Claim 2
Dependent Claim
54 words
A RAW MIX FOR THE MANUFACTURE OF STOPPER HEADS, SAID MIX CONSISTING OF FROM 15 TO 50% BY WEIGHT OF A PLASTIC REFRACTORY CLAY, 15 TO 50% BY WEIGHT OF REFRACTORY CLAY GROG AND FROM 12 TO 20% BY WEIGHT OF FLAKE GRAPHITE AND COMPRISING FROM 12 TO 20% BY WEIGHT OF FUSED SILICA.
References Cited (Backward Citations)
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US1458725A
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US1289578A
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US2300683A
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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) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |