Patent US3713875A successfully refreshed from Google Patents.
US3713875A
Expired / Lapsed
US
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Filter-and screen cloths made from coated polyester material
Assignee: Hoechst AG
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Filing: 1970-05-01
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Granted: 1973-01-30
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Expires: 1990-05-01
Abstract
Abstract THE PRESENT INVENTION RELATES TO FILER- AND SCREEN CLOTHS MADE FROM POLYESTER YARNS, POLYESTER CORD YARNS OR POLYESTER MONOFILS WHICH HAVE BEEN COATED WITH A THERMOPLASTIC MATERIAL BEING RESISTANT TO HYDROLYSIS AND MELTING AT A TEMPERATURE ABOVE 130*C. THE POLYESTER YARNS, CORD YARNS OR -MONOFILS CONSISTING, FOR EXAMPLE, OF POLYETHYLENE TEREPHTHALATE; THE COATING MAY CONSISTS, FOR EXAMPLE, OF POLYETHYLENE, POLYPROPYLENE OR POLY-(4METHYLPENTENE-1).
Inventors
- 👤 G Beyer
- 👤 H Nagelsmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:33
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/0492; B01D2239/12; B01D2239/1291; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T442/00; Y10T442/20; Y10T442/2861
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |