Patent US3526531A successfully refreshed from Google Patents.
US3526531A
Expired / Lapsed
US
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Method for making microporous sheet material
Assignee: Kanebo Ltd
•
Filing: 1967-11-21
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Granted: 1970-09-01
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Expires: 1987-11-21
Abstract
No abstract record available.
Inventors
- 👤 Kohin Asano
- 👤 Kojiro Sagi
- 👤 Shigeru Kawase
- 👤 Tohru Kitazawa
- 👤 Hiroo Ohba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; D; D06; D06N; D06N3/00; D06N3/0056; D06N3/0063; D06N3/12; D06N3/14; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA622884A
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US2871218A
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US2919205A
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US2950214A
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US3100721A
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US3190765A
Cited
US3190766A
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US3208875A
Cited
US3214290A
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US3238055A
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US3424604A
Cited
US3348963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |