US3577369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bark fiber as a dispersing agent for high temperature molding thermoplstics
Assignee: Weyerhaeuser Co
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Filing: 1967-03-08
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Granted: 1971-05-04
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Expires: 1987-03-08
Abstract
Abstract THE INVENTION COMPRISES THE USE OF DOUGLAS FIR BARK FIBER AS A DISPERSING AGENT FOR REINFORCED POLYPROPYLENE MOLDING COMPOUND WHICH CAN BE USED AT ELEVATED MOLDING CONDITIONS. THE BARK FIBER MAY BE INCORPORATED INTO THE REINFORCED MOLDING COMPOUND BY SIMPLE BLENDING METHODS TO PROVIDE A HOMOGENEOUS MOLDING PREMIX, YET PROVIDE THE ARTICLE MANUFACTURED AND PRODUCED THEREBY WITH THE REINFORCING MATERIAL DISPERSED UNIFORMLY THEREIN.
Inventors
- 👤 Hubert E Hendrickson
- 👤 Charles N Mccain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:25
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08K; C08K3/00; C08K3/01; C08K3/013; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C08K7/12; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |