Patent US1811242A successfully refreshed from Google Patents.
US1811242A
Expired / Lapsed
US
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Heat conducting high temperature resistant refractory
Assignee: Doherty Research Co
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Filing: 1928-06-11
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Granted: 1931-06-23
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Expires: 1948-06-11
Abstract
No abstract record available.
Inventors
- 👤 John D Morgan
- 👤 William G Bjorkstedt
- 👤 Russell E Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:06
CPC Classifications
C; C22; C22C; C22C16/00
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) | 1934-06-22 | 1934-12-22 | 1935-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-06-22 | 1938-12-22 | 1939-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-06-22 | 1942-12-22 | 1943-06-23 | $7700.00 | Window Closed / Lapsed |