US2569541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulation comprising polyethylene, polyisobutylene, isobutylene-diolefin copolymer, and lubricant
Assignee: Bishop Manufacturing Corp
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Filing: 1949-10-19
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Granted: 1951-10-02
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Expires: 1969-10-19
Abstract
No abstract record available.
Inventors
- 👤 Harold E Selby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:03
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN INSULATING COMPOSITION CONSISTING ESSENTIALLY OF BETWEEN ABOUT 24 AND 28 PARTS OF POLYETHYLENE HAVING A MOLECULAR WEIGHT OF ABOUT 20,000, BETWEEN ABOUT 14 AND 30 PARTS OF AT LEAST ONE ISOBUTYLENE HOMOPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 40,000 AND 60,000, BETWEEN ABOUT 7 AND 14 PARTS OF A RUBBERY COPOLYMER OF ISOBUTYLENE AND A DIOLEFIN IN APPROXIMATELY THE PROPORTIONS OF 98:2, AND BETWEEN ABOUT 1/2 PART AND 2 PARTS OF A LUBRICANT ALL PARTS BEING BY WEIGHT, SAID COMPOSITION BEING THERMOPLASTIC AND EXTRUDABLE AT ELEVATED TEMPERATURE AND RESISTANT TO SHATTERING UNDER IMPACT AT TEMPERATURES BELOW 0* F.
Claim 2
Dependent Claim
100 words
AN INSULATING COMPOSITION CONSISTING ESSENTIALLY OF BETWEEN ABOUT 24 AND 28 PARTS OF POLYETHYLENE HAVING A MOLECULAR WEIGHT OF ABOUT 20,000, BETWEEN ABOUT 14 AND 30 PARTS OF AT LEAST ONE ISOBUTYLENE HOMOPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 40,000 AND 60,000, BETWEEN ABOUT 7 AND 14 PARTS OF A RUBBERY COPOLYMER OF ISOBUTYLENE AND A DIOLEFIN IN APPROXIMATELY THE PROPORTIONS OF 98:2, AND BETWEEN ABOUT 1/2 PART AND 2 PARTS OF A LUBRICANT ALL PARTS BEING BY WEIGHT, SAID COMPOSITION BEING THERMOPLASTIC AND EXTRUDABLE AT ELEVATED TEMPERATURE AND RESISTANT TO SHATTERING UNDER IMPACT AT TEMPERATURES BELOW 0* F.
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) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |