Patent US5868706A successfully refreshed from Google Patents.
US3539388A
Expired / Lapsed
US
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Processes of making microporous polymer sheets
Assignee: Emhart Enterprises Corp
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Filing: 1967-04-17
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Granted: 1970-11-10
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Shu-Tung Tu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:43
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C67/202; C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; Y; Y10; Y10S; Y10S264/00; Y10S264/62; Y10S264/77
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2956310A
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US3108009A
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US3100721A
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US3413184A
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US3342759A
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US3264134A
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 |