Patent US3020813A successfully refreshed from Google Patents.
US3020813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint cleaning and filling machine
Assignee: Individual
•
Filing: 1956-07-23
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Granted: 1962-02-13
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Expires: 1976-07-23
Abstract
No abstract record available.
Inventors
- 👤 Charles P Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:33
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/06; E01C23/09; E01C23/096
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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |