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Patent US3072972A successfully refreshed from Google Patents.
US3072972A
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Method for making cellular polypropylene using nitroguanidine as the blowing agent
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1959-02-25
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Granted: 1963-01-15
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Expires: 1979-02-25
Abstract
No abstract record available.
Inventors
- 👤 Yokose Kyohei
- 👤 Motoyama-Cho
- 👤 Watanabe Masao
- 👤 Yoshida Iwao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:28
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
51 words
THE METHOD OF INSULATING A CONDUCTOR OF 0.5 MM. SIZE CONSISTING OF THE STEPS OF MIXING 100 PARTS OF LOW PRESSURE POLYPROPYLENE AND 2.0 PARTS OF NITROGUANIDINE, APPLYING AN EXTRUDING PRESSURE AT A TEMPERATURE OF 235*C. TO EXTRUDE THE MIXTURE OVER THE CONDUCTOR AND SIMULTANEOUSLY FOAM THE INSULATION TO 0.9 MM.
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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |