US3529778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding method and system
Assignee: Rheinische Kalksteinwerke GmbH
•
Filing: 1966-05-05
•
Granted: 1970-09-22
•
Expires: 1986-05-05
Abstract
No abstract record available.
Inventors
- 👤 Karl Willmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:04
CPC Classifications
B; B02; B02C; B02C21/00; B02C25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2332701A
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US2446551A
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US2894696A
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US3011726A
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US3078050A
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US3145935A
Cited
US3369761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |