Patent US3471309A successfully refreshed from Google Patents.
US3471309A
Expired / Lapsed
US
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Thermal copying process with lignin reaction in copy sheet
Assignee: International Business Machines Corp
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Filing: 1965-12-30
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Granted: 1969-10-07
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Expires: 1985-12-30
Abstract
No abstract record available.
Inventors
- 👤 James O Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:53
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38235; B41M5/025; B41M5/035; B41M5/124; B41M5/132; B41M5/155; G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA720308A
Cited
US3262386A
Cited
GB986053A
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US3121650A
Cited
US3265891A
Cited
US3363556A
Cited
US3170395A
Cited
US3377286A
Cited
US3360367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |