US2243219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous refractory and process of manufacture
Assignee: Cities Service Oil Co
•
Filing: 1938-06-25
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Granted: 1941-05-27
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Expires: 1958-06-25
Abstract
No abstract record available.
Inventors
- 👤 John D Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:04
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/34; C04B28/342; C04B35/00; C04B35/01; C04B35/48; C04B35/481; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S264/00; Y10S264/63
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) | 1944-05-26 | 1944-11-25 | 1945-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-05-26 | 1948-11-25 | 1949-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-05-26 | 1952-11-25 | 1953-05-27 | $7700.00 | Window Closed / Lapsed |