US3938536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reducing the turbulent drag in conduits and around submerged objects
Assignee: University of Delaware
•
Filing: 1974-10-11
•
Granted: 1976-02-17
•
Expires: 1994-10-11
Abstract
Abstract 1. The reduction of turbulent drag of fluids flowing through conduits such as pipelines, channels, troughs and streams, or of drag on an object which is moving relative to a fluid, which comprises adding to said fluid a mixture of soluble polymeric substances and of suspended fibers.
Inventors
- 👤 Arthur B. Metzner
- 👤 Raymond C. Vaseleski
- 👤 Wei-Kuo Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:37
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
A process for reducing the turbulent drag of a fluid in a conduit or around a submerged object which comprises adding to the fluid a soluble polymer and a dispersable non-soluble fibrous substance having an aspect ratio of at least 100.
Claim 2
Dependent Claim
41 words
A process for reducing the turbulent drag of a fluid in a conduit or around a submerged object which comprises adding to the fluid a soluble polymer and a dispersable non-soluble fibrous substance having an aspect ratio of at least 100.
Claim 3
Dependent Claim
26 words
The process of claim 1 in which the carrier liquid contains 10-10,000 p.p.m. of the suspended fibrous substance and 1-2,000 p.p.m. of the dissolved polymeric matter.
Claim 4
Dependent Claim
56 words
A process of claim 1 in which the polymeric material used is chosen from the commonly-known inventory of satisfactory drag reducing polymeric additives but is of such a state of molecular weight or of degradation that, by itself, it exhibits little or no drag reduction in flow processes of a scale which are of practical interest.
Claim 5
Dependent Claim
56 words
A process of claim 2 in which the polymeric material used is chosen from the commonly-known inventory of satisfactory drag reducing polymeric additives but is of such a state of molecular weight or of degradation that, by itself, it exhibits little or no drag reduction in flow processes of a scale which is of practical interest.
Claim 6
Dependent Claim
62 words
A process, having as either its primary or important secondary purpose, the transfer of heat and/or mass from a process fluid stream in which a dissolved polymer and a dispersed non-soluble fibrous substance having an aspect ratio of at least 100 are added to the process fluid for the purpose of reducing the turbulent pressure drop required to pump the fluid stream.
Claim 7
Dependent Claim
62 words
A process, having as either its primary or important secondary purpose, the transfer of heat and/or mass from a process fluid stream in which a dissolved polymer and a dispersed non-soluble fibrous substance having an aspect ratio of at least 100 are added to the process fluid for the purpose of reducing the turbulent pressure drop required to pump the fluid stream.
References Cited (Backward Citations)
US3351079A
Cited
US3537525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |