US2543548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractories
Assignee: Findlay Clay Products Co
•
Filing: 1948-07-10
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Granted: 1951-02-27
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Expires: 1968-07-10
Abstract
No abstract record available.
Inventors
- 👤 Edward C Henry
- 👤 John L Leech
- 👤 Leland R Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A REFRACTORY MIXTURE CONSISTING OF (BY WEIGHT) REFRACTORY BONDING CLAY 25%, OF WHICH KAOLIN IS 8% CRUSHED PYROPHYLLITE CALCINED WITHIN THE RANGE OF 1000* C. TO 1400* C. 75%
Claim 2
Dependent Claim
29 words
A REFRACTORY MIXTURE CONSISTING OF (BY WEIGHT) REFRACTORY BONDING CLAY 25%, OF WHICH KAOLIN IS 8% CRUSHED PYROPHYLLITE CALCINED WITHIN THE RANGE OF 1000* C. TO 1400* C. 75%
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) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |