Patent US3565308A successfully refreshed from Google Patents.
US3565308A
Expired / Lapsed
US
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Devices for fibrillating sheet material
Assignee: Plasticisers Ltd
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Filing: 1968-06-18
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Granted: 1971-02-23
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Expires: 1988-06-18
Abstract
Abstract A rotatable drum having plural cutting elements over its surface, arranged in a manner to obtain a smaller transverse spacing between adjacent slits in the fibrillated material, than in previously proposed devices. Four different types of construction of drum are proposed each allowing for the particular arrangement of cutting elements.
Inventors
- 👤 Philip T Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:18
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10T; Y10T225/00; Y10T225/30; Y10T225/329; Y10T83/00; Y10T83/929; Y10T83/9314
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
A fibrillator for producing parallel slits in sheet material comprising: a drum rotatable about its axis and cutaway to form a plurality of equally circularly spaced apart axially parallel slots in the surface thereof; a metal strip located in each slot and secured therein; a plurality of needles secured to each metal strip to form a comb with the needles equally spaced apart along the length of the strip and protruding beyond the surface of the drum; and spacer means between the ends of the slots and the ends of the metal strips, whereby a staggering effect is obtained between the needles in adjacent combs.
Claim 2
Dependent Claim
105 words
A fibrillator for producing parallel slits in sheet material comprising: a drum rotatable about its axis and cutaway to form a plurality of equally circularly spaced apart axially parallel slots in the surface thereof; a metal strip located in each slot and secured therein; a plurality of needles secured to each metal strip to form a comb with the needles equally spaced apart along the length of the strip and protruding beyond the surface of the drum; and spacer means between the ends of the slots and the ends of the metal strips, whereby a staggering effect is obtained between the needles in adjacent combs.
Claim 3
Dependent Claim
26 words
A fibrillator as set forth in claim 1, wherein the cutting elements are inclined to the normal to the drum surface on the trailing side thereof.
Claim 4
Dependent Claim
30 words
A fibrillator as set forth in claim 2 wherein the angle between each cutting element and the normal to the drum surface at the base of the element is 15*.
Claim 5
Dependent Claim
32 words
A fibrillator as set forth in claim 1, wherein the slots are inclined to the surface of the drum so that the needles protrude therebeyond at an angle to the drum surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |