Plastic bag sealer
Abstract
Abstract A MACHINE FOR HEAT SEALING THE TOPS OF PLASTIC BAGS WHICH ARE EITHER PLAIN, FLAT FOLDED, OR GUSSET-TYPE, THE MACHINE BEING CHARACTERIZED BY HOT AIR SEALING NOZZLES AND ASSOCIATED ELECTRIC HEATERS POSITIONED AT A SEAL FORMING STATION ALONG THE PATH TRANSVERSED BY CO-OPERATING RUNS OF PARALLEL, ENDLESS TRAVELING CONVEYOR BELTS WHICH GRIP THE FOLDED OR CLOSED TOPS OF THE BAGS ADJACENT THE SEAL FORMING AREA AND ADVANCE WITH THE SAME PAST THE SEAL FORMING STATION TO A SEAL COOLING STATION WHERE COLD AIR NOZZLES SET THE SEAL, WITH THE BAGS BEING CARRIED IN A SUPPORTING CONVEYOR AND WITH MEANS FOR CONTROLLING THE SPEED OF THE BAG SUPPORTING AND TOP GRIPPING CONVEYORS WHICH IS RESPONSIVE TO A THICKNESS SENSING MEANS TO AUTOMATICALLY SLOW DOWN THE TRAVEL OF THE BAG PAST THE SEAL FORMING STATION WHEN A THICKER PORTION OF THE BAG, SUCH AS A GUSSETED PORTION, REACHES THE SEAL FORMING STATION.
Inventors
- 👤 William Lourdes Davis
Bibliographic Details
Claims Analysis
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |