Patent US514648A successfully refreshed from Google Patents.
Patent US3672915A successfully refreshed from Google Patents.
US3672915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure release valve for flexible pouches
Assignee: Dow Chemical Co
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Filing: 1970-04-10
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Granted: 1972-06-27
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Expires: 1990-04-10
Abstract
Abstract IN A PACKAGE INCLUDING A FLEXIBLE POUCH, THE POUCH NORMALLY COMPRISING A TUBULAR BODY AND STRIP SEALS CLOSING THE OPPOSITE ENDS OF THE TUBULAR BODY, THE IMPROVEMENT OF WHICH COMPRISES, A ONE WAY PRESSURE RELEASE VALVE COMPRISING AN INTERIORLY DISPOSED ELEMENT SUCH AS A MONOFILAMENT OR STRAND ANCHORED ITS OPPOSITE ENDS, RESPECTIVELY, BY SECUREMENT WITH THE LAYER OF THE POUCH AT THE STRIP SEAL AREAS. A VALVING OR VENTING ACTION OCCURS WHEN A FACE REGION OF ONE OF THE ELEMENT ENDS RELEASES FROM THE ADIJACENT LAYER IN THE SEAL.
Inventors
- 👤 Glenn C Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:30
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/01; B65D75/00; B65D75/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |