Patent US2438081A successfully refreshed from Google Patents.
US2438081A
Expired / Lapsed
US
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Record controlled accounting machine
Assignee: International Business Machines Corp
•
Filing: 1943-07-15
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Granted: 1948-03-16
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Expires: 1963-07-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Watson
- 👤 Horace S Beattie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:10
CPC Classifications
G; G06; G06C; G06C11/00; G06C11/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1875849A
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US2124177A
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US2016704A
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US2131226A
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US2007375A
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US2126621A
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US2185260A
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US2244241A
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US2199561A
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US2340772A
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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) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |