Patent US4534994A successfully refreshed from Google Patents.
US4534994A
Expired / Lapsed
US
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Process for making fine perforations in plastic sheeting and/or plastic or rubber coated sheet materials
Assignee: Individual
•
Filing: 1984-05-03
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Granted: 1985-08-13
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Expires: 2004-05-03
Abstract
Abstract A process for making fine perforations in plastic sheeting and/or plastic or rubber coated sheet materials in which the sheeting or the coating is too thick and/or the dielectric constants are too high for electrically making the fine perforations, including the steps of coarsely perforating the material by non-electrical methods, coating the perforated material with a layer of a coating material which is capable of being electrically perforated, and making fine perforations in the layer of the coating material by the use of high-voltage pulses.
Inventors
- 👤 Gerhard Feld
- 👤 Klaus-Peter Schmidt-Kufeke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:06
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/26; B26F1/28; B26D; B26D7/00; B26D7/08; B26D7/084; D; D06; D06N; D06N3/00; D06N3/007
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
Process for making fine perforations in plastic sheeting and/or plastic or rubber coated sheet materials in which the sheeting or the coating is too thick and/or the dielectric constants thereof are too high for making the fine perforations by electrical pulses, comprising the steps of: coarsely perforating the material by other means; coating the perforated material with a layer of a coating material which is capable of being electrically perforated; and making fine perforations in the layer of the coating material by the use of high-voltage pulses.
Claim 2
Dependent Claim
87 words
Process for making fine perforations in plastic sheeting and/or plastic or rubber coated sheet materials in which the sheeting or the coating is too thick and/or the dielectric constants thereof are too high for making the fine perforations by electrical pulses, comprising the steps of: coarsely perforating the material by other means; coating the perforated material with a layer of a coating material which is capable of being electrically perforated; and making fine perforations in the layer of the coating material by the use of high-voltage pulses.
Claim 3
Dependent Claim
19 words
The process as defined in claim 1, wherein said step of perforating the material includes mechanically perforating the material.
Claim 4
Dependent Claim
22 words
The process as defined in claim 1, wherein said coating step includes coating with a thin homogeneous layer of the coating material.
Claim 5
Dependent Claim
18 words
The process as defined in claim 1, wherein said coating step includes coating with a plastic coating material.
Claim 6
Dependent Claim
24 words
The process as defined in claim 2, wherein said step of perforating the material includes perforating the material mechanically with the aid of needles.
Claim 7
Dependent Claim
28 words
The process as defined in claim 1, wherein said step of coating the perforated material with a layer of the coating material includes coating by using coating means.
Claim 8
Dependent Claim
15 words
The process as defined in claim 1, wherein said coating step includes coating by spraying.
Claim 9
Dependent Claim
22 words
The process as defined in claim 1, wherein said coating step includes depositing the coating material as a liquid onto the material.
Claim 10
Dependent Claim
24 words
The process as defined in claim 1, wherein said coating step includes depositing the coating material in a paste like form onto the material.
References Cited (Backward Citations)
US2055002A
Cited
US2994617A
Cited
US3307961A
Cited
US3656988A
Cited
US4064386A
Cited
US4278871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |