US2547323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unburned refractory brick making
Assignee: General Refractories Co
•
Filing: 1947-06-20
•
Granted: 1951-04-03
•
Expires: 1967-06-20
Abstract
No abstract record available.
Inventors
- 👤 Heuer Russell Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US727114A
Cited
US825088A
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US876783A
Cited
US1666936A
Cited
US2253620A
Cited
US2406909A
Cited
US2460761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |