US2686744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealable wrapping material
Assignee: Akzo Nobel UK PLC
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Filing: 1951-10-11
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Granted: 1954-08-17
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Expires: 1971-10-11
Abstract
No abstract record available.
Inventors
- 👤 Ralph T K Cornwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
B; B65; B65D; B65D65/00; B65D65/38; B65D65/40; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/052; C09; C09J; C09J7/00; C09J7/20; C09J7/21; C09J7/30; C09J7/35; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/50; D21H19/00; D21H19/10; D21H19/14; D21H19/20; D21H19/22; C08J2301/00; C08J2465/00; C08J2465/02; Y; Y10; Y10S; Y10S138/00; Y10S138/07; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
138 words
AS AN ARTICLE OF MANUFACTURE, A COMPOSITE HEAT-SEALABLE WRAPPING MATERIAL WHICH COMPRISES A REGENERATED CELLULOSE SHEET CARRYING A SUBSTANTIALLY UNIFORMLY DISTRIBUTED THERMOSET MELAMINE-FORMALDEHYDE RESIN CHARACTERIZED IN THAT IN A STATE OF PARTIAL POLYMERIZATION LESS THAN THAT CHARACTERIZING A GEL IT FORMS ACIDIC AQUEOUS SOLUTIONS OF FROM 0.5% TO 20% BY WEIGHT CONCENTRATION WHICH ARE WATER-DILUTABLE, COLLODIAL IN NATURE, AND HAVE POSITIVELY CHARGED, HYDROPHILIC PARTICLES OF LESS THAN ABOUT 1 MICRON IN DIAMETER, AND A FILM OF POLYTHENE HAVING A MOLECULAR WEIGHT BETWEEN 10,000 AND 38,000 AND A SOFTENING POINT BETWEEN 100* C. AND 112* C., THE POLYTHRENE FILM BEING FIRMLY ANCHORED TO THE THERMOSET MELAMINE-FORMALDEHYDE RESIN AND THROUGH SAID RESIN TO REGENERATED CELLULOSE SHEET WHEREBY THE WRAPPING MATERIAL IS ADAPTED TO BE HEAT-SEALED ON CONVENTIONAL WRAPPING MACHINES WITHOUT SEPARATION OF THE POLYTHENE FILM FROM THE REGENERATED CELLULOSE SHEET.
References Cited (Backward Citations)
US2219700A
Cited
US2175125A
Cited
GB551339A
Cited
US2559220A
Cited
US2394009A
Cited
US2563897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |