Patent US3791792A successfully refreshed from Google Patents.
US3791792A
Expired / Lapsed
US
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Polymer cure determination method
Assignee: Northrop Grumman Corp
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Filing: 1972-03-29
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Granted: 1974-02-12
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Expires: 1992-03-29
Abstract
Abstract A pair of electrodes formed of dissimilar metals are placed in an uncured resin. As the resin cures, the material produces a dc potential up to several hundred millivolts. The potential can be plotted with time of cure as an indication of the relative rate of chemical activity occurring during the curing period.
Inventors
- 👤 N Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:12
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/44; G01N33/442; B; B29; B29C; B29C35/00; B29C35/02; B29C35/0288
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
14 words
The method of claim 1 wherein the electrodes are comprised of aluminum and lead.
Claim 2
Dependent Claim
25 words
The method of claim 1 comprising: providing said polymer as an uncured liquid in a suitable storage vessel, and disposing said electrodes in said vessel.
Claim 3
Dependent Claim
22 words
The method of claim 1 further comprising: matching the impedance of a specimen to a plotting device with a calibrating load attenuator.
Claim 4
Dependent Claim
14 words
The method of claim 1 further comprising: subjecting the polymer to cure conditions therefor.
Claim 5
Dependent Claim
39 words
The method of claim 5 comprising: maintaining said electrodes in contact with said polymer during at least a portion of a curing period, and connecting the electrodes to a plotter for plotting the potential change over the period measured.
Claim 6
Dependent Claim
19 words
The method of claim 1 comprising: impregnating said polymer on a substrate, and contacting said substrate with said electrodes.
Claim 7
Dependent Claim
16 words
The method of claim 7 further comprising: maintAining contact pressure between said electrodes and said substrate.
References Cited (Backward Citations)
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |