Patent US5633695A successfully refreshed from Google Patents.
Patent US2991757A successfully refreshed from Google Patents.
US2991757A
Expired / Lapsed
US
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Lead sharpening machine
Assignee: Individual
•
Filing: 1957-07-08
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Granted: 1961-07-11
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Expires: 1977-07-08
Abstract
No abstract record available.
Inventors
- 👤 Dahle Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:23
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE18205C
Cited
US530018A
Cited
GB189712218A
Cited
US831753A
Cited
US1038112A
Cited
GB191202344A
Cited
US2540320A
Cited
US2615426A
Cited
US2618240A
Cited
US2785657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |