US3464790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making synthetic sintered magnesia
Assignee: Magnesitwerk Aken GmbH
•
Filing: 1965-10-21
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Granted: 1969-09-02
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Richard Schrader
- 👤 Wilfried Grunwoldt
- 👤 Hubert Hennek
- 👤 Gotz Kneschke
- 👤 Helmut Reinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:12
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3133792A
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US1273110A
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US2668749A
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US2640759A
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US3104216A
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US3249453A
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US3340079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-01 | 1973-03-03 | 1973-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-01 | 1977-03-03 | 1977-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-01 | 1981-03-03 | 1981-09-02 | $7700.00 | Window Closed / Lapsed |