US2742555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame boring apparatus
Assignee: Individual
•
Filing: 1952-10-03
•
Granted: 1956-04-17
•
Expires: 1972-10-03
Abstract
No abstract record available.
Inventors
- 👤 Robert W Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:07
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14; E21B7/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1371094A
Cited
US1847864A
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US1898926A
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US1927135A
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US2398427A
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US2441319A
Cited
US2471695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |