Patent US3506471A successfully refreshed from Google Patents.
US3506471A
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US
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Pressure-sensitive fluorane derivative containing copying paper
Assignee: Fujifilm Holdings Corp
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Filing: 1967-11-14
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Granted: 1970-04-14
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Expires: 1987-11-14
Abstract
No abstract record available.
Inventors
- 👤 Shiro Kimura
- 👤 Teruo Kobayashi
- 👤 Sadao Shige
- 👤 Shizio Katayama
- 👤 Isao Hirano
- 👤 Toshiyuki Nita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:34
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31844; Y10T428/31848
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |