Patent US4704757A successfully refreshed from Google Patents.
US4704757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrading material
Assignee: Impak Marketing Ltd
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Filing: 1985-04-04
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Granted: 1987-11-10
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Expires: 2005-04-04
Abstract
Abstract Abrasive sheet material knitted from at least two or more yarns at least one of which is a shrinkable yarn and provides a knitted ground structure, loops of a non-shrinkable yarn being secured to the knitted ground structure so that upon shrinking of the shrinkable yarn or yarns, loops of the non-shrinkable yarn upstand from the surface of the ground structure.
Inventors
- 👤 David C. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:45
CPC Classifications
D; D04; D04B; D04B1/00; D04B1/02; D04B1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
An abrasive sheet material comprising a knitted ground structure formed of a heat shrinkable first material, said knitted ground structure having laid in floated threads of a second material in the form of projecting loops, said second material being harder than said first material and being less shrinkable than said ground structure material, said ground structure being shrunk from its as knitted state with said loops of said second material extending from the surface of said knitted ground structure in the form of abrading elements, and with said abrasive sheet material being folded to enclose a resilient core and defining a scouring pad, the surface of said sheet material from which said loops of said second material are raised forming an external surface of said scouring pad whereby in use of said scouring pad substantially only said second material makes contact with the work to be scoured with said shrunken ground structure serving as an anchor for said loops and as an enclosure for said resilient core.
Claim 2
Dependent Claim
167 words
An abrasive sheet material comprising a knitted ground structure formed of a heat shrinkable first material, said knitted ground structure having laid in floated threads of a second material in the form of projecting loops, said second material being harder than said first material and being less shrinkable than said ground structure material, said ground structure being shrunk from its as knitted state with said loops of said second material extending from the surface of said knitted ground structure in the form of abrading elements, and with said abrasive sheet material being folded to enclose a resilient core and defining a scouring pad, the surface of said sheet material from which said loops of said second material are raised forming an external surface of said scouring pad whereby in use of said scouring pad substantially only said second material makes contact with the work to be scoured with said shrunken ground structure serving as an anchor for said loops and as an enclosure for said resilient core.
Claim 3
Dependent Claim
23 words
An abrasive sheet material folded into a scouring pad according to claim 1 in which said resilient core is impregnated with a detergent.
Claim 4
Dependent Claim
126 words
An abrasive sheet material comprising a knitted ground structure formed of a heat shrinkable first material, said knitted ground structure having laid in floated threads of a second material in the form of a projecting loops, said second material being harder than said first material and being less shrinkable than said ground structure material, said ground structure being shrunk from its as knitted state with said loops of said second material extending from the surface of said knitted ground structure in the form of abrading elements, and in which said knitted ground structure comprises alternate courses of PVC yarn and polyester yarn with loops of said second material being tucked to tuck stitches which are each the fourth stitch of each course of said PVC yarn.
Claim 5
Dependent Claim
126 words
An abrasive sheet material comprising a knitted ground structure formed of a heat shrinkable first material, said knitted ground structure having laid in floated threads of a second material in the form of a projecting loops, said second material being harder than said first material and being less shrinkable than said ground structure material, said ground structure being shrunk from its as knitted state with said loops of said second material extending from the surface of said knitted ground structure in the form of abrading elements, and in which said knitted ground structure comprises alternate courses of PVC yarn and polyester yarn with loops of said second material being tucked to tuck stitches which are each the fourth stitch of each course of said PVC yarn.
Claim 6
Dependent Claim
99 words
An abrasive sheet material comprising a knitted ground structure formed of a heat shrinkable first material, said knitted ground structure having laid in floated threads of a second material in the form of projecting loops, said second material being harder than said first material and being less shrinkable than said ground structure material, said ground structure being shrunk from its as knitted state with said loops of said second material extending from the surface of said knitted ground structure in the form of abrading elements, and in which said tuck stitches are staggered walewise one relative to the other.
Claim 7
Dependent Claim
99 words
An abrasive sheet material comprising a knitted ground structure formed of a heat shrinkable first material, said knitted ground structure having laid in floated threads of a second material in the form of projecting loops, said second material being harder than said first material and being less shrinkable than said ground structure material, said ground structure being shrunk from its as knitted state with said loops of said second material extending from the surface of said knitted ground structure in the form of abrading elements, and in which said tuck stitches are staggered walewise one relative to the other.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |