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US3468368A
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Assignee: Oglebay Norton Co
•
Filing: 1968-09-05
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Granted: 1969-09-23
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Expires: 1988-09-05
Abstract
No abstract record available.
Inventors
- 👤 Walter M Charman
- 👤 James H Borden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:38
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA708524A
Cited
US1921729A
Cited
US2462255A
Cited
US2663920A
Cited
US2792214A
Cited
US3106756A
Cited
US3216689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |