US4403502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscometer for cast foaming materials and associated method
Assignee: University of Pittsburgh
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Filing: 1981-03-04
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Granted: 1983-09-13
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Expires: 2001-03-04
Abstract
Abstract A motionless viscometer and associated method for resinous materials including polymeric foams and non-resinous materials includes a reservoir section, a receiver section and an interposed tube. As the foam is expanded the axial pressure within the connecting tube is measured as is the rate of rise of the foam within the receiver element. Shear viscosity and density as functions of time may be determined.
Inventors
- 👤 Jan T. Lindt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:14
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/02; G01N11/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
65 words
A viscometer for foaming materials comprising reservoir means for containing a supply of material to be foamed, receiver means for receiving a portion of the foamed material, pressure sensing means for measuring the pressure of said material as it is foamed, and rise measuring means operatively associated with said receiver means for measuring the rate of rise of said foaming material within said receiver means.
Claim 2
Dependent Claim
65 words
A viscometer for foaming materials comprising reservoir means for containing a supply of material to be foamed, receiver means for receiving a portion of the foamed material, pressure sensing means for measuring the pressure of said material as it is foamed, and rise measuring means operatively associated with said receiver means for measuring the rate of rise of said foaming material within said receiver means.
Claim 3
Dependent Claim
16 words
The viscometer of claim 1 including tube means connecting said reservoir means with said receiver means.
Claim 4
Dependent Claim
17 words
The viscometer of claim 2 including said pressure sensing means being operatively associated with said tube means.
Claim 5
Dependent Claim
32 words
The viscometer of claim 2 including said tube means being a tube having a maximum transverse dimension less than the maximum transverse dimension of either said reservoir means or said receiver means.
Claim 6
Dependent Claim
13 words
The viscometer of claim 2 wherein said tube means include a capillary tube.
Claim 7
Dependent Claim
19 words
The viscometer of claim 5 including said tube means being of substantially uniform internal diameter throughout its longitudinal extent.
Claim 8
Dependent Claim
29 words
The viscometer of claim 2 including said rise measuring means including transducer means for monitoring movement of the upper surface of said polymeric foam and emitting responsive electrical signals.
Claim 9
Dependent Claim
16 words
The viscometer of claim 7 including said transducer means being an ultrasonic transducer depth measuring device.
Claim 10
Dependent Claim
30 words
The viscometer of claim 8 including said rise measuring means including float means for cooperating with said ultrasonic transducer depth measuring device in determining the movement of said upper surface.
Claim 11
Dependent Claim
29 words
The viscometer of claim 2 including said pressure sensing means including at least one pressure transducer for sensing pressure within said tube means and emitting a responsive electrical signal.
Claim 12
Dependent Claim
26 words
The viscometer of claim 10 including temperature sensing means operatively associated with said receiver means and said reservoir means for measuring the temperature of said foam.
Claim 13
Dependent Claim
13 words
The viscometer of claim 11 including said temperature sensing means including thermocouple means.
Claim 14
Dependent Claim
18 words
The viscometer of claim 10 including said pressure sensing means including a series of axially spaced pressure transducers.
Claim 15
Dependent Claim
32 words
The viscometer of claim 10 including said reservoir means and said receiver means have an average transverse extent of about 2 to 50 times the average transverse extent of said tube means.
Claim 16
Dependent Claim
19 words
The method of testing polymeric foams of claim 1 including determining said viscosity and density as functions of time.
Claim 17
Independent Claim
66 words
A method of testing foaming materials comprising providing reservoir means for containing a supply of material to be foamed and receiver means for receiving the polymeric foam, initiating foaming action, sensing the pressure of said expanding foam, measuring the rate of rise of said expanding foam in said receiver means, and employing said pressure and said rate of rise to determine viscosity of the foaming material.
Claim 18
Independent Claim
66 words
A method of testing foaming materials comprising providing reservoir means for containing a supply of material to be foamed and receiver means for receiving the polymeric foam, initiating foaming action, sensing the pressure of said expanding foam, measuring the rate of rise of said expanding foam in said receiver means, and employing said pressure and said rate of rise to determine viscosity of the foaming material.
Claim 19
Dependent Claim
27 words
The method of claim 16 including employing said method in connection with polymeric foaming materials and employing said method to determine shear viscosity of said foaming material.
Claim 20
Dependent Claim
17 words
The method of claim 17 including providing tube means, and sensing said pressure in said tube means.
Claim 21
Dependent Claim
18 words
The method of testing polymeric foams of claim 16 including employing pressure transducer means to measure said pressure.
Claim 22
Dependent Claim
22 words
The method of testing polymeric foams of claim 19 including employing ultrasonic transducer depth finding means to measure said rate of rise.
Claim 23
Dependent Claim
25 words
The method of testing polymeric foams of claim 16 including measuring the temperatures of said foam within said reservoir means and within said receiver means.
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |