US3597312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic fibrous filler and paper containing the filler
Assignee: Westvaco Corp
•
Filing: 1969-05-07
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Granted: 1971-08-03
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Expires: 1989-05-07
Abstract
Abstract SYNTHETIC, ORGANIC FILMS, FIBROUS FILLER COMPRISING BLUSHED, FIBROUS POLYSTYRENE HAVING HIGH OPACITY AS REPRESENTED BY SCATTERING COEFFICIENTS OF AT LEAST ABOUT 0.25. THE OPAQUE, FIBROUS POLYSTYRENE IS SUITABLE FOR USE AS FILLER MATERIAL IN THE MANUFACTURE OF PAPER.
Inventors
- 👤 Harry F Kohne Jr
- 👤 Frederick L Kurrle
- 👤 Felipe S Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:29
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/14; D01; D01D; D01D5/00; D01D5/06; D01D5/11; D01F; D01F6/00; D01F6/02; D01F6/20; D01F6/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |