Patent US3478191A successfully refreshed from Google Patents.
US3478191A
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US
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Thermal print head
Assignee: Sprague Electric Co
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Filing: 1967-01-23
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Granted: 1969-11-11
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Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 Theodore W Johnson
- 👤 Charles G Kalt
- 👤 Jacob H Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:13
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; H; H05; H05B; H05B3/00; H05B3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3323241A
Cited
US3354565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |