Patent US3204540A successfully refreshed from Google Patents.
US3204540A
Expired / Lapsed
US
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Proportional space recording devices
Assignee: International Business Machines Corp
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Filing: 1960-12-16
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Granted: 1965-09-07
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Expires: 1980-12-16
Abstract
No abstract record available.
Inventors
- 👤 Robert T Blakely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:34
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/14; B; B41; B41B; B41B17/00; B41B17/04; B41B17/16; G06F; G06F3/00; G06F3/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2865270A
Cited
US2876687A
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US2902677A
Cited
FR1113397A
Cited
US2918655A
Cited
US3046530A
Cited
US2992410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |