Patent US2795240A successfully refreshed from Google Patents.
Patent US1858317A successfully refreshed from Google Patents.
US1858317A
Expired / Lapsed
US
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Refractory for contact with molten glass
Assignee: Hartford Empire Co
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Filing: 1928-08-25
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Granted: 1932-05-17
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Expires: 1948-08-25
Abstract
No abstract record available.
Inventors
- 👤 Paul G Willetts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:59
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C03B5/43; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
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) | 1935-05-17 | 1935-11-16 | 1936-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-17 | 1939-11-16 | 1940-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-17 | 1943-11-16 | 1944-05-17 | $7700.00 | Window Closed / Lapsed |