US3559407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial seaweed
Assignee: Shell USA Inc
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Filing: 1968-11-25
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Granted: 1971-02-02
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Expires: 1988-11-25
Abstract
Abstract AN IMPROVED FORM OF "ARTIFICIAL SEAWEED" FOR COMBATING COASTAL EROSION AND THE LIKE COMPRISES AN ANCHORED ARRAY OF FILAMENTARY STRANDS OF FOAMED, STRETCHED POLYOLEFIN, CHARACTERIZED BY INTERNAL PLEXIFORM STRUCTURE SURROUNDED BY A SUBSTANTIALLY CLOSED, THIN SKIN, HAVING A TENSILE STRENGTH OF AT LEAST ABOUT 1 GRAM PER DENIER AND A FINAL DENSITY BELOW 500 G./1. ING COASTAL EROSION AND THE LIKE COMPRISES AN ANCHORED ARRAY OF FILAMENTARY STRANDS OF FOAMED, STRETCHED POLYOTEFIN, CHARACTERIZED BY A INTERNAL PLEXIFORM STRUCTURE SURROUNDED BY A SUBSTANTIALLY CLOSED, THIN SKIN, HAVING A TENSILE STRENGHT OF A LEAST ABOUT 1 GRAM PER DENIER AND A FINAL DENSITY BELOW 500 G./1.
Inventors
- 👤 Gerrit Schuur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:30
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/04; E02B3/043; Y; Y02; Y02A; Y02A10/00; Y02A10/26
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |