US3257769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging method for applying shrinkable covers
Assignee: WR Grace and Co
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Filing: 1963-02-07
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Granted: 1966-06-28
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Expires: 1983-02-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:16
CPC Classifications
B; B65; B65B; B65B7/00; B65B7/16; B65B7/28; B65B7/2842; B65B7/2885
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF APPLYING A FILM COVERING TO A PANSUPPORTED PIE WHICH COMPRISES FRICTIONALLY ENGAGING A SHEET OF HIGH SHRINK ENERGY FILM ALONG ITS LATERAL EDGES, SUPPORTING THE ENGAGED FILM OVER A PIPE, HEATING THE FILM ALONG ITS EXPOSED AREA ADJACENT ITS LATERAL MARGINS TO CAUSE THE FILM TO PULL FREE OF ITS FRICTIONAL ENGAGEMENT AND SHRINK INTO TIGHT CONTACT WITH RESTRICTED AREAS OF THE PAN, THEN HEATING THE ENTIRE AREA OF FILM EXPOSED BEYOND THE PAN MARGIN TO SHRINK THE FILM INTO SEALING ENGAGEMENT WITH THE PERIPHERY OF THE PAN, COOLING THE PERIPHERAL SEAL, AND SUBSEQUENTLY HEATING THE ENTIRE EXPOSED COVERING TO SHRINK THE FILM AGAINST THE PIE.
Claim 2
Independent Claim
109 words
THE METHOD OF APPLYING A FILM COVERING TO A PANSUPPORTED PIE WHICH COMPRISES FRICTIONALLY ENGAGING A SHEET OF HIGH SHRINK ENERGY FILM ALONG ITS LATERAL EDGES, SUPPORTING THE ENGAGED FILM OVER A PIPE, HEATING THE FILM ALONG ITS EXPOSED AREA ADJACENT ITS LATERAL MARGINS TO CAUSE THE FILM TO PULL FREE OF ITS FRICTIONAL ENGAGEMENT AND SHRINK INTO TIGHT CONTACT WITH RESTRICTED AREAS OF THE PAN, THEN HEATING THE ENTIRE AREA OF FILM EXPOSED BEYOND THE PAN MARGIN TO SHRINK THE FILM INTO SEALING ENGAGEMENT WITH THE PERIPHERY OF THE PAN, COOLING THE PERIPHERAL SEAL, AND SUBSEQUENTLY HEATING THE ENTIRE EXPOSED COVERING TO SHRINK THE FILM AGAINST THE PIE.
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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |