Patent US3355997A successfully refreshed from Google Patents.
US3355997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a valve bag
Assignee: Amcor Flexibles North America Inc
•
Filing: 1966-08-03
•
Granted: 1967-12-05
•
Expires: 1986-08-03
Abstract
No abstract record available.
Inventors
- 👤 Milton J Heimos
- 👤 Avron A Snabb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:01
CPC Classifications
B; B65; B65D; B65D31/00; B65D31/14; B65D31/142; Y; Y10; Y10S; Y10S493/00; Y10S493/916; Y10S493/927; Y10S493/929
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
THE METHOD OF MAKING A VALVE BAG OF HEAT-SEALABLE SHEET PLASTIC MATERIAL COMPRISING FORMING A FLAT TUBE OF SAID PLASTIC MATERIAL WITH HEAT-SEAL-INHIBITING MATERIAL IN AN AREA ON THE INSIDE THEREOF EXTENDING AROUND ONE CORNER AT ONE END OF THE TUBE, OPENING UP SAID ONE END OF THE TUBE BY FOLDING OPEN A PORTION OF ONE WALL OF THE TUBE ON A FOLD LINE EXTENDING TRANSVERSELY ACROSS THE TUBE TO FORM A VALVE FLAP AT SAID ONE CORNER, WITH SAID HEAT-SEAL-INHIBITING MATERIAL ON THE INSIDE OF SAID FLAP, POSITIONING A VALVE SLEEVE OF HEAT-SEALABLE SHEET PLASTIC MATERIAL ON THE OPENED-UP END OF THE TUBE WITH ONE END OF THE SLEEVE CONSITUTING ITS OUTER END OVERLYING THE FLAP AND WITH THE SLEEVE EXTENDING INWARD FROM THE FLAP, HEAT-SEALING THE SLEEVE TO THE FLAP BY APPLYING HEAT AND PRESSURE IN THE REGION OF SAID HEAT-SEAL-INHIBITING MATERIAL, FOLDING CLOSED THE OPENED-UP END PORTION OF THE SAID ONE WALL OF THE TUBE WITH ACCOMPANYING FOLDING IN HALF OF THE SLEEVE AND FLAP ON THEIR LONGITUDINAL CENTER LINES, AND FORMING CLOSURES FOR THE ENDS OF THE TUBE.
Claim 2
Independent Claim
182 words
THE METHOD OF MAKING A VALVE BAG OF HEAT-SEALABLE SHEET PLASTIC MATERIAL COMPRISING FORMING A FLAT TUBE OF SAID PLASTIC MATERIAL WITH HEAT-SEAL-INHIBITING MATERIAL IN AN AREA ON THE INSIDE THEREOF EXTENDING AROUND ONE CORNER AT ONE END OF THE TUBE, OPENING UP SAID ONE END OF THE TUBE BY FOLDING OPEN A PORTION OF ONE WALL OF THE TUBE ON A FOLD LINE EXTENDING TRANSVERSELY ACROSS THE TUBE TO FORM A VALVE FLAP AT SAID ONE CORNER, WITH SAID HEAT-SEAL-INHIBITING MATERIAL ON THE INSIDE OF SAID FLAP, POSITIONING A VALVE SLEEVE OF HEAT-SEALABLE SHEET PLASTIC MATERIAL ON THE OPENED-UP END OF THE TUBE WITH ONE END OF THE SLEEVE CONSITUTING ITS OUTER END OVERLYING THE FLAP AND WITH THE SLEEVE EXTENDING INWARD FROM THE FLAP, HEAT-SEALING THE SLEEVE TO THE FLAP BY APPLYING HEAT AND PRESSURE IN THE REGION OF SAID HEAT-SEAL-INHIBITING MATERIAL, FOLDING CLOSED THE OPENED-UP END PORTION OF THE SAID ONE WALL OF THE TUBE WITH ACCOMPANYING FOLDING IN HALF OF THE SLEEVE AND FLAP ON THEIR LONGITUDINAL CENTER LINES, AND FORMING CLOSURES FOR THE ENDS OF THE TUBE.
References Cited (Backward Citations)
US2959343A
Cited
US3237534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |