Patent US3418891A successfully refreshed from Google Patents.
US3418891A
Expired / Lapsed
US
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Method of making a reclosable bag
Assignee: Gulf Oil Corp
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Filing: 1967-02-10
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Granted: 1968-12-31
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Expires: 1987-02-10
Abstract
No abstract record available.
Inventors
- 👤 Samuel J Rivman
- 👤 Carysforth Henry Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:25
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/74; B31B70/81; B31B70/813; B31B2160/00; B31B2160/10; B31B70/812; B31B70/8123
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A METHOD FOR MAKING RECLOSABLE THERMPLASTIC BAGS, SAID METHOD COMPRISING THE STEPS OF FOLDING THERMOPLASTIC SHEET MATERIAL TO FORM OPPOSED SIDE-WALLS OF SAID BAGS AND LEAVING AN EXPOSED EDGE OF SAID SHEET TO FORM A FLAP, CONTINUOUSLY FEEDING SAID SHEET PAST A FIRST STATION, CONTINUOUSLY LAYING DOWN A WIRE ON SAID FLAP AT SAID FIRST STATION, CONTINUOUSLY FEEDING SAID SHEET AND SAID WIRE PAST A SECOND STATION, EXTRUDING AND LAYING OVER SAID WIRE AND ONTO SAID FLAP A RELATIVELY WIDE SHEET OF HEATED THERMOPLASTIC MATERIAL, CUTTING SAID SHEET TO FORM SAID BAGS, AND HEAT-SEALING THE EDGES OF SAID BAGS.
Claim 2
Independent Claim
99 words
A METHOD FOR MAKING RECLOSABLE THERMPLASTIC BAGS, SAID METHOD COMPRISING THE STEPS OF FOLDING THERMOPLASTIC SHEET MATERIAL TO FORM OPPOSED SIDE-WALLS OF SAID BAGS AND LEAVING AN EXPOSED EDGE OF SAID SHEET TO FORM A FLAP, CONTINUOUSLY FEEDING SAID SHEET PAST A FIRST STATION, CONTINUOUSLY LAYING DOWN A WIRE ON SAID FLAP AT SAID FIRST STATION, CONTINUOUSLY FEEDING SAID SHEET AND SAID WIRE PAST A SECOND STATION, EXTRUDING AND LAYING OVER SAID WIRE AND ONTO SAID FLAP A RELATIVELY WIDE SHEET OF HEATED THERMOPLASTIC MATERIAL, CUTTING SAID SHEET TO FORM SAID BAGS, AND HEAT-SEALING THE EDGES OF SAID BAGS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |