Patent US3474872A successfully refreshed from Google Patents.
US3474872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact boring machine
Assignee: Danuser Machine Co Inc
•
Filing: 1967-02-08
•
Granted: 1969-10-28
•
Expires: 1987-02-08
Abstract
No abstract record available.
Inventors
- 👤 John Henry Danuser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:34
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/027; E21B7/028
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1604896A
Cited
US2088649A
Cited
US2410959A
Cited
US2480537A
Cited
US2415572A
Cited
US2509410A
Cited
US2533123A
Cited
US2643858A
Cited
US2581535A
Cited
US2701124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |