Patent US4636161A successfully refreshed from Google Patents.
US4636161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen for selectively perforating thermoplastic film
Assignee: Tredegar Film Products LLC
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Filing: 1985-04-11
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Granted: 1987-01-13
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Expires: 2005-04-11
Abstract
Abstract An apparatus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable molding element means for receiving the film and which means has a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired pattern of perforated areas and non-perforated areas are imparted to the film with each of said areas being continuous across the web of the film and alternating in the machine direction.
Inventors
- 👤 Garland E. Raley
- 👤 Dean M. Spear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:00
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/02; B29C59/06; B26; B26F; B26F1/00; B26F1/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A screen for selectively perforating thermoplastic sheet or film consisting essentially of a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern, a fine mesh airflow restrictor sheet material mounted over the surface of a portion of said base pattern screen for providing predetermined localized restriction of an airflow through the base pattern screen when a pressure differential is applied to the surface of the base pattern screen and an overlay screen mounted over said airflow restrictor sheet material and secured on said base pattern screen, said airflow restrictor sheet material being spunbonded-nonwoven breathable thermally resistant material.
Claim 2
Dependent Claim
104 words
A screen for selectively perforating thermoplastic sheet or film consisting essentially of a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern, a fine mesh airflow restrictor sheet material mounted over the surface of a portion of said base pattern screen for providing predetermined localized restriction of an airflow through the base pattern screen when a pressure differential is applied to the surface of the base pattern screen and an overlay screen mounted over said airflow restrictor sheet material and secured on said base pattern screen, said airflow restrictor sheet material being spunbonded-nonwoven breathable thermally resistant material.
Claim 3
Dependent Claim
16 words
The screen of claim 1, wherein said spunbonded-nonwoven breathable thermally resistant material is remay polyester cloth.
Claim 4
Dependent Claim
21 words
The screen of claim 1, wherein said airflow restrictor sheet material comprises two layers of spunbonded-non-woven breathable thermally resistant sheet material.
Claim 5
Dependent Claim
21 words
The screen of claim 3, wherein said layers of spun-bonded-nonwoven breathable thermally resistant sheet material are each about 5 mils thick.
Claim 6
Dependent Claim
113 words
A screen for selectively perforating thermoplastic sheet or film consisting essentially of cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern, a fine mesh airflow restrictor sheet material mounted over the surface of a portion of said base pattern screen for providing predetermined localized restriction of an airflow through the base pattern screen when a pressure differential is applied to the base pattern screen, an overlay screen mounted over said airflow restrictor sheet material, said overlay screen having a plurality of openings therein for imparting a particular shaped perforation in a plastic film placed thereover when said pressure differential is applied to the base pattern screen.
Claim 7
Dependent Claim
113 words
A screen for selectively perforating thermoplastic sheet or film consisting essentially of cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern, a fine mesh airflow restrictor sheet material mounted over the surface of a portion of said base pattern screen for providing predetermined localized restriction of an airflow through the base pattern screen when a pressure differential is applied to the base pattern screen, an overlay screen mounted over said airflow restrictor sheet material, said overlay screen having a plurality of openings therein for imparting a particular shaped perforation in a plastic film placed thereover when said pressure differential is applied to the base pattern screen.
Claim 8
Dependent Claim
17 words
The screen of claim 5, wherein said airflow restrictor sheet material is a breathable thermally resistant material.
Claim 9
Dependent Claim
29 words
The screen of claim 5, wherein said airflow restrictor sheet material has a plurality of openings therein which are much smaller than the openings in the base pattern screen.
Claim 10
Dependent Claim
169 words
A screen for selectively perforating thermoplastic sheet or film consisting essentially of a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern; a fine mesh airflow restrictor sheet material mounted over the surface of a portion of said base pattern screen for providing predetermined localized restriction of an airflow through the base pattern screen when a pressure differential is applied to the surface of the base pattern screen; and, an overlay screen mounted over said airflow restrictor sheet material and secured on said base pattern screen; said base pattern screen being made of material of sufficiently high heat conductivity to effect a reduction in the relative temperature of those portions of a thermoplastic sheet or film which come in contact with a solid surface of the base pattern screen as distinguished from those portions of the thermoplastic sheet or film which are directly over a void in the base screen; and said airflow restrictor sheet material being spunbonded-nonwoven breathable thermally resistant material.
Claim 11
Dependent Claim
169 words
A screen for selectively perforating thermoplastic sheet or film consisting essentially of a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern; a fine mesh airflow restrictor sheet material mounted over the surface of a portion of said base pattern screen for providing predetermined localized restriction of an airflow through the base pattern screen when a pressure differential is applied to the surface of the base pattern screen; and, an overlay screen mounted over said airflow restrictor sheet material and secured on said base pattern screen; said base pattern screen being made of material of sufficiently high heat conductivity to effect a reduction in the relative temperature of those portions of a thermoplastic sheet or film which come in contact with a solid surface of the base pattern screen as distinguished from those portions of the thermoplastic sheet or film which are directly over a void in the base screen; and said airflow restrictor sheet material being spunbonded-nonwoven breathable thermally resistant material.
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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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |