Patent US2572875A successfully refreshed from Google Patents.
US2572875A
Expired / Lapsed
US
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Pencil sharpener
Assignee: SPENGLER LOOMIS Manufacturing Co
•
Filing: 1949-02-21
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Granted: 1951-10-30
•
Expires: 1969-02-21
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Markvart
- 👤 Andrew P Solem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:06
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/02; B43L23/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB156265A
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DE573095C
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US1872476A
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US2068693A
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US2146890A
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DE712799C
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DE701636C
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CH217789A
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CH208560A
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US2408767A
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US2438628A
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US2434870A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |