Patent US2850720A successfully refreshed from Google Patents.
US2850720A
Expired / Lapsed
US
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Data recording and playback device
Assignee: Monroe Calculating Machine Co
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Filing: 1951-11-09
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Granted: 1958-09-02
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Expires: 1971-11-09
Abstract
No abstract record available.
Inventors
- 👤 Walter S Oliwa
- 👤 Jr Howard M Fleming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:39
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/023; G06F3/0232
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2279018A
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US2609907A
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US2587532A
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US2609143A
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US2564403A
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US2701095A
Cited
US2652554A
Cited
US2549071A
Cited
US2614169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |