US3092439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a reinforced edge aperture in heat shrinkable material
Assignee: WR Grace and Co
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Filing: 1961-03-21
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Granted: 1963-06-04
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Expires: 1981-03-21
Abstract
No abstract record available.
Inventors
- 👤 John W Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:28
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/02; B26F1/06; B26F1/10; B29; B29C; B29C61/00; B29C61/02; B29L; B29L2031/00; B29L2031/737; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T83/00; Y10T83/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A METHOD OF FORMING AN APERTURE OF DESIRED SIZE AND SHAPE AND HAVING A THICKENED FLEXIBLE EDGE IN A HEAT SHRINKABLE BIAXIALLY ORIENTED FILM OF A POLYMER OF AN OLEFIN HAVING 2 TO 3 CARBON ATOMS COMPRISING THE STEPS OF: PREFORMING AN APERTURE OF DESIRED SHAPE BUT SMALLER THAN THE DESIRED SIZE IN THE FILM; APPLYING HEAT TO THE FILM IN A LOCALIZED AREA ABOUT THE PREFORMED APERTURE THEREBY CAUSING THE APERTURE TO INCREASE IN SIZE WITH THE EDGE OF THE FILM ABOUT THE APERTURE SHRINKING BACK AND FORMING A REINFORCED FLEXIBLE RING AROUND THE APERTURE WHICH IS LESS ORIENTED AND THICKER THAN THE FILM, THE FLEXIBLE RING HAVING A HIGHER TEAR RESISTANCE THAN THE FILM.
Claim 2
Independent Claim
116 words
A METHOD OF FORMING AN APERTURE OF DESIRED SIZE AND SHAPE AND HAVING A THICKENED FLEXIBLE EDGE IN A HEAT SHRINKABLE BIAXIALLY ORIENTED FILM OF A POLYMER OF AN OLEFIN HAVING 2 TO 3 CARBON ATOMS COMPRISING THE STEPS OF: PREFORMING AN APERTURE OF DESIRED SHAPE BUT SMALLER THAN THE DESIRED SIZE IN THE FILM; APPLYING HEAT TO THE FILM IN A LOCALIZED AREA ABOUT THE PREFORMED APERTURE THEREBY CAUSING THE APERTURE TO INCREASE IN SIZE WITH THE EDGE OF THE FILM ABOUT THE APERTURE SHRINKING BACK AND FORMING A REINFORCED FLEXIBLE RING AROUND THE APERTURE WHICH IS LESS ORIENTED AND THICKER THAN THE FILM, THE FLEXIBLE RING HAVING A HIGHER TEAR RESISTANCE THAN THE FILM.
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) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |