Patent US3889870A successfully refreshed from Google Patents.
US3889870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welded polyester bags
Assignee: Hoechst AG
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Filing: 1972-12-05
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Granted: 1975-06-17
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Expires: 1992-12-05
Abstract
Abstract This invention relates to a welded bag of stretched polyester film, comprising a biaxially stretched tubular film with a bottom weld.
Inventors
- 👤 Hugo Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:06
CPC Classifications
B; B65; B65D; B65D31/00; Y; Y10; Y10S; Y10S383/00; Y10S383/908
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
A WELDED BAG OF STRETCHED POLYESTER FILM, COMPRISING A BIAXIALLY STRETCHED TUBULAR FILM WITH A BOTTOM WELD, IN WHICH THE EDGE REGION OF THE BOTTOM WELD IS POST-STRETCHED.
Claim 2
Dependent Claim
28 words
A WELDED BAG OF STRETCHED POLYESTER FILM, COMPRISING A BIAXIALLY STRETCHED TUBULAR FILM WITH A BOTTOM WELD, IN WHICH THE EDGE REGION OF THE BOTTOM WELD IS POST-STRETCHED.
Claim 3
Dependent Claim
21 words
A bag as claimed in claim 1 in which the edge region of the bottom weld is post-stretched in orthogonal directions.
References Cited (Backward Citations)
US2664358A
Cited
US3053386A
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US3062373A
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US2979113A
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US3478952A
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US3516537A
Cited
US3638790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |