US1969099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of highly refractory products
Assignee: Evonik Operations GmbH
•
Filing: 1931-03-26
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Granted: 1934-08-07
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Expires: 1951-03-26
Abstract
No abstract record available.
Inventors
- 👤 Ryschkewitsch Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/46; C04B35/50
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) | 1937-08-06 | 1938-02-05 | 1938-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-08-06 | 1942-02-05 | 1942-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-08-06 | 1946-02-05 | 1946-08-07 | $7700.00 | Window Closed / Lapsed |