Patent US2749684A successfully refreshed from Google Patents.
US2749684A
Expired / Lapsed
US
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Combined grinding and lapping disc having flat working surfaces
Assignee: Joh Urbanek & Co
•
Filing: 1952-05-28
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Granted: 1956-06-12
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Expires: 1972-05-28
Abstract
No abstract record available.
Inventors
- 👤 Schuhmann Julius August Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:16
CPC Classifications
B; B24; B24D; B24D7/00; B24D7/14
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |