US3666689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid compositions
Assignee: BP PLC
•
Filing: 1969-03-28
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Granted: 1972-05-30
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Expires: 1989-03-28
Abstract
Abstract Polymeric compositions based on, e.g., polyethylene or poly vinyl chloride containing ultra-fine metal flakes produced by grinding metals in an organic liquid are electrically conductive. The specific resistance can be decreased in some cases to less than 10 1 ohm. cm.
Inventors
- 👤 Aleksander Jerzy Groszek
- 👤 Rodney Ernest Witheridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:15
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; C22; C22C; C22C32/00; C22C32/0094; H; H01; H01B; H01B1/00; H01B1/20; H01B1/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
A composition as claimed in claim 1 which has a specific resistivity of Less than 25 ohm-cm.
Claim 2
Dependent Claim
28 words
A composition as claimed in claim 1 in which the said finely divided metal has a heat of adsorption of n-butanol of at least 0.01 calorie per gram.
Claim 3
Dependent Claim
80 words
A plastics composition as claimed in claim 1 having a specific resistivity of less than 25 ohm-cm. which comprises from 95 - 10 percent by weight of a thermoplastic material and from 5 to 90 percent by weight of a finely divided metal having a surface area of at least 2 square meters per gram, a bulk density of less than 0.5 gram per cubic centimeter and a heat of adsorption with n-butanol of at least 0.5 calorie per gram.
Claim 4
Dependent Claim
20 words
A composition as claimed in claim 4 in which the said thermoplastic material is selected from polyolefins and halogenated polyolefins.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |