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 06:40
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/027; E21B7/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2088649A
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US2410959A
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US2480537A
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US2415572A
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US2509410A
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US2533123A
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US2643858A
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US2581535A
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US2701124A
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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) | 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 |