Patent US1650577A successfully refreshed from Google Patents.
US1650577A
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US
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Zirconia-faced refractory
Assignee: Hartford Empire Co
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Filing: 1926-01-20
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Granted: 1927-11-22
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Expires: 1946-01-20
Abstract
No abstract record available.
Inventors
- 👤 Paul G Willetts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/46; C04B35/50; Y; Y10; Y10S; Y10S264/00; Y10S264/25
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) | 1930-11-21 | 1931-05-23 | 1931-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-11-21 | 1935-05-23 | 1935-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-11-21 | 1939-05-23 | 1939-11-22 | $7700.00 | Window Closed / Lapsed |