Patent US3131853A successfully refreshed from Google Patents.
US3131853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic valve bag
Assignee: Stamicarbon BV
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Filing: 1962-10-29
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Granted: 1964-05-05
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Expires: 1982-10-29
Abstract
No abstract record available.
Inventors
- 👤 Quaadgras Dirk
- 👤 Arend J Van Muylwijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:07
CPC Classifications
B; B65; B65D; B65D31/00; B65D31/14; B65D31/147
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A FLAT PLASTIC BAG COMPRISING TWO FILM WALLS JOINED TO EACH OTHER ALONG THEIR SIDE EDGES AND HEAT SEALED AT BOTH ENDS, SAID BAG HAVING A FILLING OPENING EXTENDING ALONG ONE SIDE EDGE OF THE BAG NEAR BUT SPACED FROM ONE END THEREOF, AND A CLOSURE FLAP INSIDE THE BAG BEHIND SAID FILLING OPENING, SAID FLAP BEING FOLDED DOUBLE ALONG THE SIDE EDGE OF THE BAG TO FORM TWO INWARDLY EXTENDING FLAP PARTS, THE UPPER EDGES OF SAID FLAP PARTS BEING WELDED TO EACH OTHER AND TO THE BAG WALLS ALONG THE NEAR END SEAL OF THE BAG, THE LOWER EDGES OF SAID FLAP PARTS BEING WELDED TO THE BAG WALLS ONLY.
Claim 2
Dependent Claim
112 words
A FLAT PLASTIC BAG COMPRISING TWO FILM WALLS JOINED TO EACH OTHER ALONG THEIR SIDE EDGES AND HEAT SEALED AT BOTH ENDS, SAID BAG HAVING A FILLING OPENING EXTENDING ALONG ONE SIDE EDGE OF THE BAG NEAR BUT SPACED FROM ONE END THEREOF, AND A CLOSURE FLAP INSIDE THE BAG BEHIND SAID FILLING OPENING, SAID FLAP BEING FOLDED DOUBLE ALONG THE SIDE EDGE OF THE BAG TO FORM TWO INWARDLY EXTENDING FLAP PARTS, THE UPPER EDGES OF SAID FLAP PARTS BEING WELDED TO EACH OTHER AND TO THE BAG WALLS ALONG THE NEAR END SEAL OF THE BAG, THE LOWER EDGES OF SAID FLAP PARTS BEING WELDED TO THE BAG WALLS ONLY.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |