US3197953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene rope
Assignee: WR Grace and Co
•
Filing: 1963-06-03
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Granted: 1965-08-03
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Expires: 1983-06-03
Abstract
No abstract record available.
Inventors
- 👤 Henry D Dawbarn
- 👤 Joseph W Arnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
D; D07; D07B; D07B5/00; D07B5/12; D07B1/00; D07B1/02; D07B2205/00; D07B2205/20; D07B2205/201; D07B2205/2014
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A POLYPROPYLENE ROPE STABILIZED AGAINST UNWINDING, UNTWISTING AND FRAYING WHEN CUT BY HEATING THE SAID ROPE TO A TEMPERATURE OF FROM ABOUT 135*F. TO ABOUT 300*F. BUT BELOW THE SOFTENING POINT OF THE SAID POLYPROPYLENE AND STRETCHING FROM ABOUT 5 TO ABOUT 50 PERCENT WHILE IN THE HEATED STATE; SAID ROPE CONTAINING: (A) A TWISTED CENTRAL HEART STRAND AND (B), AROUND THE HEART STRAND, AT LEAST ONE WRAP HAVING AT LEAST 3 STRANDS IN SIDE BY SIDE RELATIONSHIP WITH THE DIRECTION OF ANY ADJACENT WRAPS BEING OPPOSITE TO EACH OTHER END WITH THE TWIST IN THE STRANDS OF ANY WRAP BEING OPPOSITE IN DIRECTION TO THAT OF THE WRAP ITSELF WHICH CONTAINS THE STRANDS; EACH OF SAID STRANDS HAVING A TWIST OF FROM AVBOUT 2 TO ABOUT 30 TURNS/FT., A TOTAL DENIER FROM ABOUT 3,000 TO ABOUT 250,000 AND CONTAINING A PLURALITY OF CONTINUOUS ORIENTED POLYPROPYLENE FILAMENTS HAVING AN INDIVIDUAL DENIER OF FROM ABOUT 3 TO ABOUT 1,000.
Claim 2
Dependent Claim
158 words
A POLYPROPYLENE ROPE STABILIZED AGAINST UNWINDING, UNTWISTING AND FRAYING WHEN CUT BY HEATING THE SAID ROPE TO A TEMPERATURE OF FROM ABOUT 135*F. TO ABOUT 300*F. BUT BELOW THE SOFTENING POINT OF THE SAID POLYPROPYLENE AND STRETCHING FROM ABOUT 5 TO ABOUT 50 PERCENT WHILE IN THE HEATED STATE; SAID ROPE CONTAINING: (A) A TWISTED CENTRAL HEART STRAND AND (B), AROUND THE HEART STRAND, AT LEAST ONE WRAP HAVING AT LEAST 3 STRANDS IN SIDE BY SIDE RELATIONSHIP WITH THE DIRECTION OF ANY ADJACENT WRAPS BEING OPPOSITE TO EACH OTHER END WITH THE TWIST IN THE STRANDS OF ANY WRAP BEING OPPOSITE IN DIRECTION TO THAT OF THE WRAP ITSELF WHICH CONTAINS THE STRANDS; EACH OF SAID STRANDS HAVING A TWIST OF FROM AVBOUT 2 TO ABOUT 30 TURNS/FT., A TOTAL DENIER FROM ABOUT 3,000 TO ABOUT 250,000 AND CONTAINING A PLURALITY OF CONTINUOUS ORIENTED POLYPROPYLENE FILAMENTS HAVING AN INDIVIDUAL DENIER OF FROM ABOUT 3 TO ABOUT 1,000.
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |