US2608384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill
Assignee: Individual
•
Filing: 1948-05-21
•
Granted: 1952-08-26
•
Expires: 1968-05-21
Abstract
No abstract record available.
Inventors
- 👤 Henry R Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:45
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312565A
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US1367042A
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US1530764A
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US1838539A
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US1595922A
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US1660999A
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US1804819A
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US1779581A
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US2198016A
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US2251916A
Cited
US2247188A
Cited
US2345816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-26 | 1956-02-25 | 1956-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-26 | 1960-02-25 | 1960-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-26 | 1964-02-25 | 1964-08-26 | $7700.00 | Window Closed / Lapsed |