US3756907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of perforated non woven fibrous webs
Assignee: Carl Freudenberg KG
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Filing: 1970-11-17
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Granted: 1973-09-04
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Expires: 1990-11-17
Abstract
Abstract PERFORATED NON-WOVEN FABRICS ARE PRODUCED BY FORMING A FIBROUS WEB CONTAINING A BINDER, FORMING ELONGATED SLITS IN SAID WEB, PARTIALLY SETTING THE BINDER, STRETCHING SAID WEB TRANSVERSELY OF SAID SLITS WHEREBY SAID SLITS FORM HOLES, AND COMPLETING SETTING OF SAID BINDER WITH SAID WEB IN STRETCHED CONDITION WHEREBY SAID WEB IS BONDED AND RETAINS SAID HOLES EVEN UPON RELEASE OF THE STRETCHING FORCE.
Inventors
- 👤 W Heling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:01
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/42; D04H1/425; D04H1/4258; D04H1/4326; D04H1/4334; D04H1/587; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |