Patent US3528879A successfully refreshed from Google Patents.
US3528879A
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US
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Process for making paper and air-pervious cardboard or boardlike structures predominantly of polytetrafluoroethylene
Assignee: Daikin Industries Ltd
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Filing: 1964-10-12
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Granted: 1970-09-15
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Expires: 1984-10-12
Abstract
No abstract record available.
Inventors
- 👤 Yutaka Kometani
- 👤 Shun Koizumi
- 👤 Kazuo Kubota
- 👤 Takeaki Nakazima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:32
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08J5/04; D; D21; D21H; D21H5/00; D21H5/12; D21H5/20; H; H01; H01H; H01H33/00; H01H33/70; H01H33/7015; H01H33/7023; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/298
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2936301A
Cited
US3015604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |