Patent US3859762A successfully refreshed from Google Patents.
Patent US2438628A successfully refreshed from Google Patents.
US2438628A
Expired / Lapsed
US
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Pencil sharpener
Assignee: Individual
•
Filing: 1944-08-12
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Granted: 1948-03-30
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Expires: 1964-08-12
Abstract
No abstract record available.
Inventors
- 👤 John A Yerkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:50
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/02; B43L23/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189412417A
Cited
GB190410644A
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US1170093A
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US1206460A
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DE319546C
Cited
GB156265A
Cited
US1421063A
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US1534547A
Cited
US1637849A
Cited
US1872476A
Cited
US2335148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-30 | 1951-09-29 | 1952-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-30 | 1955-09-29 | 1956-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-30 | 1959-09-29 | 1960-03-30 | $7700.00 | Window Closed / Lapsed |