US4265960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films produced from LDPE encapsulated CaCO3
Assignee: Mobil Oil AS
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Filing: 1978-12-26
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Granted: 1981-05-05
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Expires: 1998-12-26
Abstract
Abstract Fine particle size CaCO3 is encapsulated with low density polyethylene (LDPE) in a fluid energy mill. Very thin extrusion oriented films (as low as 0.4 mil.) were made using the LDPE encapsulated CaCO3 at high concentrations of 32-61%. Such films are soft and have a dry "feel" and translucent appearance with slip and anti-block properties. They can be heat sealed, printed, and folded. The films can be used as paper and paper tissue substitutes.
Inventors
- 👤 Harold A. Arbit
- 👤 Harold G. Tinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:03
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B32; B32B; B32B27/00; B32B27/18; B32B27/20; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/2438; Y10T428/25; Y10T428/258
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
Thin, biaxially oriented films of low-density polyethylene, having a thickness between 0.4 mil and about 3 mils, filled with between about 30 weight percent and about 60 weight percent calcium carbonate, wherein said films are produced from calcium carbonate having a particle size below 20 microns encapsulated in low density polyethylene.
Claim 2
Dependent Claim
51 words
Thin, biaxially oriented films of low-density polyethylene, having a thickness between 0.4 mil and about 3 mils, filled with between about 30 weight percent and about 60 weight percent calcium carbonate, wherein said films are produced from calcium carbonate having a particle size below 20 microns encapsulated in low density polyethylene.
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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |