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US2811335A
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Mobile roof drill
Assignee: JH Fletcher and Co
•
Filing: 1952-11-19
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Granted: 1957-10-29
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Expires: 1972-11-19
Abstract
No abstract record available.
Inventors
- 👤 Fletcher James Robert
- 👤 William F Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:19
CPC Classifications
E; E21; E21D; E21D20/00; E21D20/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1834701A
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US2055520A
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US2168522A
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US2296819A
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US2362161A
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US2409843A
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US2670931A
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US2673452A
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US2634587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |