Patent US4124529A successfully refreshed from Google Patents.
Patent US3579397A successfully refreshed from Google Patents.
US3579397A
Expired / Lapsed
US
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Process of manufacturing bags having tear strips and consisting of synthetic thermoplastics
Assignee: Windmoeller and Hoelscher KG
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Filing: 1967-08-07
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Granted: 1971-05-18
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Expires: 1987-08-07
Abstract
Abstract A TUBING LENGTH PORTION CORRESPONDING TO THE LENGTH OF THE DESIRED BAG, AND FLAT SHEETING IN A LENGTH PORTION CORRESPONDING TO THE DESIRED WIDTH OF THE TEAR STRIP, ARE FED DURING EACH CYCLE OF THE MACHINE BETWEEN THE JAWS OF A TRANSVERSE HEAT SEALING AND CUTTING STATION, THE WIDTH OF THE FLAT SHEETING EXCEEDS THE WIDTH OF THE TUBING BY THE LENGTH OF THE TEAR TAB. A TRANSVERSE HEAT-SEALED SEAM JOINING THE TUBING WALLS AND THE FLAT SHEETING IS FORMED DURING THE WORKING STROKE OF THE HEAT SEALING AND CUTTING DEVICE. A TRANSVERSE SEVERING CUT IS EFFECTED AT THE SAME TIME AT A SMALL DISTANCE FROM THE HEAT-SEALED SEAM AND BEHIND THE SAME IN THE DIRECTION OF TRAVEL.
Inventors
- 👤 August Schwarzkopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:36
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/52; B65D75/58; B65D75/66; B31; B31B; B31B50/00; B31B50/74; B31B50/81; B31B50/812; B31B50/8125; B31B50/8127; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |