US3524753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a microporous film
Assignee: Porvair PLC
•
Filing: 1964-11-24
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Granted: 1970-08-18
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Expires: 1984-11-24
Abstract
No abstract record available.
Inventors
- 👤 Frank Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:30
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0043; D06N3/0052; B; B32; B32B; B32B27/00; C; C08; C08J; C08J9/00; C08J9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2665450A
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US2707201A
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US2712154A
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US2810932A
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US2953622A
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US2984869A
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US3266966A
Cited
US3035110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |