US3520874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a fine porous film
Assignee: Fujifilm Holdings Corp
•
Filing: 1967-10-06
•
Granted: 1970-07-21
•
Expires: 1987-10-06
Abstract
No abstract record available.
Inventors
- 👤 Wataru Ueno
- 👤 Hideo Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:09
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/10; C; C08; C08J; C08J9/00; C08J9/28; C08J9/36; C08J2201/00; C08J2201/04; C08J2201/054; C08J2201/0542; C08J2301/00; C08J2301/08; C08J2301/10; C08J2301/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1061771A
Cited
US2058574A
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US2106297A
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US1984416A
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US2139664A
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US2843583A
Cited
US2824779A
Cited
US2900669A
Cited
US3153105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |