US2391794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boring bar
Assignee: Individual
•
Filing: 1944-07-07
•
Granted: 1945-12-25
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Expires: 1964-07-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Francis M O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:43
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03403; B23B29/03407; Y; Y10; Y10T; Y10T407/00; Y10T407/14; Y10T407/22; Y10T407/2222; Y10T407/2238; Y10T407/224; Y10T407/2242; Y10T407/28; Y10T408/00; Y10T408/44; Y10T408/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-24 | 1949-06-25 | 1949-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-24 | 1953-06-25 | 1953-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-24 | 1957-06-25 | 1957-12-25 | $7700.00 | Window Closed / Lapsed |