Patent US3543443A successfully refreshed from Google Patents.
US3543443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for grinding large-area workpieces
Assignee: Individual
•
Filing: 1967-11-13
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Granted: 1970-12-01
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Expires: 1987-11-13
Abstract
No abstract record available.
Inventors
- 👤 Karl Heesemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:55
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/04; B24B21/10; B24B21/06; B24B21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |