Patent US2521372A successfully refreshed from Google Patents.
US2521372A
Expired / Lapsed
US
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Punching machine
Assignee: International Business Machines Corp
•
Filing: 1945-10-03
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Granted: 1950-09-05
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Expires: 1965-10-03
Abstract
No abstract record available.
Inventors
- 👤 Robert L Houston
- 👤 Robert E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:40
CPC Classifications
G; G06; G06K; G06K1/00; G06K1/02; B; B26; B26F; B26F1/00; B26F1/02; B26F1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1325195A
Cited
US1248902A
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US1370669A
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US2085910A
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US2061277A
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US2002437A
Cited
US2016705A
Cited
US2147626A
Cited
GB482668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |