Patent US3497050A successfully refreshed from Google Patents.
US3497050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon spool with frictional ribbon attaching means
Assignee: Individual
•
Filing: 1968-04-24
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Granted: 1970-02-24
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Expires: 1988-04-24
Abstract
No abstract record available.
Inventors
- 👤 Walter D Landgraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:05
CPC Classifications
B; B41; B41J; B41J33/00; B41J33/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1013882A
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US1183819A
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US1462166A
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US1578231A
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US1748649A
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US2652918A
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US2667257A
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US3152678A
Cited
US3323743A
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US3393790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |