Patent US4647981A successfully refreshed from Google Patents.
US2688264A
Expired / Lapsed
US
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Method of making rock drills
Assignee: Individual
•
Filing: 1950-02-09
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Granted: 1954-09-07
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Expires: 1970-02-09
Abstract
No abstract record available.
Inventors
- 👤 Rudquist Sven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:21
CPC Classifications
B; B23; B23K; B23K31/00; B23K31/02; B23K31/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1326643A
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US1154933A
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US1522195A
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US1990077A
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US2173109A
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US2211173A
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US2267868A
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US2374763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |