Patent US3566735A successfully refreshed from Google Patents.
US3566735A
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US
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Fibrillation
Assignee: Phillips Petroleum Co
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Filing: 1969-02-12
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Granted: 1971-03-02
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Expires: 1989-02-12
Abstract
Abstract An apparatus for fibrillating a film of thermoplastic material. The apparatus includes a pair of counterrotating rollers having confronting peripheries which define a fibrillating zone. Mechanical means are provided for applying a force on one of the rollers to maintain a predetermined pressure in the fibrillating zone.
Inventors
- 👤 Max E Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:38
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; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4833; Y10T83/4838; Y10T83/4841; Y10T83/929; Y10T83/9314; Y10T83/9372; Y10T83/9408
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
An apparatus for fibrillating an oriented film of thermoplastic material, said apparatus comprising: a cutting roller having a plurality of tapered teeth projecting radially therefrom and terminating at an outer tip with each of said teeth having a cutting edge; a backup roller arranged relative to said cutting roller so that the peripheries of said rollers define a cutting zone; and force means operative upon one of said rollers for maintaining a cutting pressure in said cutting zone to provide a predetermined fixed relation between said rollers, said means being adjustable for varying said pressure in said cutting zone so that the depth of penetration in said film may be varied to effect different lengths of slits in said film.
Claim 2
Independent Claim
120 words
An apparatus for fibrillating an oriented film of thermoplastic material, said apparatus comprising: a cutting roller having a plurality of tapered teeth projecting radially therefrom and terminating at an outer tip with each of said teeth having a cutting edge; a backup roller arranged relative to said cutting roller so that the peripheries of said rollers define a cutting zone; and force means operative upon one of said rollers for maintaining a cutting pressure in said cutting zone to provide a predetermined fixed relation between said rollers, said means being adjustable for varying said pressure in said cutting zone so that the depth of penetration in said film may be varied to effect different lengths of slits in said film.
Claim 3
Dependent Claim
22 words
The invention as recited in claim 1 wherein said backup roller includes a resilient cover for yieldably receiving said cutting blades therein.
Claim 4
Dependent Claim
17 words
The invention as recited in claim 1 wherein said force means is operative upon said cutting roller.
Claim 5
Dependent Claim
43 words
The invention as recited in claim 1 wherein said force means includes a pneumatic cylinder for imparting a force on said cutting roller, manual control means for reversing airflow to said cylinder for moving said cutting roller between said operative and inoperative positions.
Claim 6
Dependent Claim
45 words
An apparatus, as set forth in claim 1 wherein the teeth each have truncated triangular configuration and taper from a base to a tip of the tooth forming a sharp cutting edge at said tip, and wherein the bases of adjacent teeth are in engagement.
References Cited (Backward Citations)
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |