US1777818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory arch and arch brick
Assignee: AMERICAN ARCH CO
•
Filing: 1926-11-16
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Granted: 1930-10-07
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Expires: 1946-11-16
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Willett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:39
CPC Classifications
F; F23; F23J; F23J11/00; F23J11/04; F23B; F23B80/00; F23B2700/00; F23B2700/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-10-06 | 1934-04-07 | 1934-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-06 | 1938-04-07 | 1938-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-06 | 1942-04-07 | 1942-10-07 | $7700.00 | Window Closed / Lapsed |