Patent US3526752A successfully refreshed from Google Patents.
US3526752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrink tunnel for shrinking film on articles
Assignee: WR Grace and Co
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Filing: 1967-11-13
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Granted: 1970-09-01
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Expires: 1987-11-13
Abstract
Abstract This invention is directed to shrink tunnel including an inverted U-shaped housing having a hot air inlet on each side near the bottom thereof and an air outlet below the top of the packages passing through the housing with the inlets and outlets positioned to impinge air against the ends of a package passing through the tunnel and withdraw a large part of the air from the tunnel before it can rise above the top of the package; all as further described herein.
Inventors
- 👤 Sydney George Frederick Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:26
CPC Classifications
B; B65; B65B; B65B53/00; B65B53/02; B65B53/06; B65B53/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2472293A
Cited
US3156812A
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US3389530A
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US3357154A
Cited
US3378989A
Cited
US3399506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |