Patent US3926888A successfully refreshed from Google Patents.
US3697347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing air-pervious spot-bonded nonwoven fabrics
Assignee: Hercules LLC
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Filing: 1969-12-22
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Granted: 1972-10-10
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Expires: 1989-12-22
Abstract
Abstract A PROCESS OF FORMING AIR-PERVIOUS REINFORCED NONWOVEN FABRICS COMPRISES HEATING A NONWOVEN WEB IN CONTACT WITH A THERMOPLASTIC NET MTERIAL WHICH HAS UNIFORMLY SPACED THICH PROTIONS CONNECTED BVY THINNER STRANDS. THE TEMPERATURE IS SUFFICIENTLY HIGH TO MELT THE NET MATERIAL, CAUSING THE STRANDS TO DRAW BACK INTO THE THICK PORTIONS MAKING UNIFORMLY SPACED SPOTS OF MELTED THERMOPLASTIC MATERIAL.
Inventors
- 👤 Leonard T Lehmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/60; D04H1/62; D04H1/04; D04H1/08; D04H1/10; D04H1/14; D04H1/54; D04H1/559; D04H3/00; D04H3/02; D04H3/04
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |