Patent US3539374A successfully refreshed from Google Patents.
US3539374A
Expired / Lapsed
US
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Porous article
Assignee: Celanese Corp
•
Filing: 1966-11-16
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Granted: 1970-11-10
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Expires: 1986-11-16
Abstract
No abstract record available.
Inventors
- 👤 Robert B Isaacson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:34
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/58; C23C14/5806; C23C14/06; C23C14/14; C23C14/20; C23C14/5886; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2627088A
Cited
US2897098A
Cited
US2848752A
Cited
US3143434A
Cited
US2976182A
Cited
US2985503A
Cited
US2968067A
Cited
US3143436A
Cited
US3257488A
Cited
US3310505A
Cited
US3377190A
Cited
US3387077A
Cited
US3384506A
Cited
US3382306A
Cited
US3373234A
Cited
US3455727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |