US2291534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making refractories
Assignee: Individual
•
Filing: 1941-01-30
•
Granted: 1942-07-28
•
Expires: 1961-01-30
Abstract
No abstract record available.
Inventors
- 👤 William P Deppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:35
CPC Classifications
F; F27; F27D; F27D99/00; F27D99/0001; F27D99/0033; F27D99/0035; C; C04; C04B; C04B33/00; C04B33/32; C04B33/323; F24; F24S; F24S20/00; F24S20/20; F24S23/00; F24S23/30; F24S23/70; F24S23/71; F24S2020/23; Y; Y02; Y02E; Y02E10/00; Y02E10/40
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) | 1945-07-27 | 1946-01-26 | 1946-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-27 | 1950-01-26 | 1950-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-27 | 1954-01-26 | 1954-07-28 | $7700.00 | Window Closed / Lapsed |