US3383375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of polypropylene articles
Assignee: Shell USA Inc
•
Filing: 1963-05-14
•
Granted: 1968-05-14
•
Expires: 1983-05-14
Abstract
No abstract record available.
Inventors
- 👤 Vegt Anne K Van Der
- 👤 Willy H J Badrian
- 👤 Groot Engelbert A De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:05
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/08; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR THE IMPROVEMENT OF THE IMPACT STRENGTH OF SHAPED ARTICLES WHICH ARE AT LEAST 0.5 MM. IN THICKNESS AND CONSIST ESSENTIALLY OF CRYSTALLINE POLYPROPYLENE, COMPRISING THE STEPS OF HEATING THE SHAPED ARTICLE, WITHOUT CONNECTING IT TO THE MELT STATE, AT A TEMPERATURE BETWEEN THE MELTING POINT OF THE POLYPROPYLENE AND 10* C. BELOW IT FOR A PERIOD SUFFICIENT TO BRING THE ENTIRE ARTICLE TO THE DESIRED TEMPERATURE AND NOT EXCEEDING 15 MINUTES AT SAID TEMPERATURE, AND THEREAFTER PERMITTING THE ARTICLE TO COOL AT A RATE EQUIVALENT TO COOLING IN A STILL GASEOUS ATMOSPHERE AT ROOM TEMPERATURE.
Claim 2
Dependent Claim
98 words
A PROCESS FOR THE IMPROVEMENT OF THE IMPACT STRENGTH OF SHAPED ARTICLES WHICH ARE AT LEAST 0.5 MM. IN THICKNESS AND CONSIST ESSENTIALLY OF CRYSTALLINE POLYPROPYLENE, COMPRISING THE STEPS OF HEATING THE SHAPED ARTICLE, WITHOUT CONNECTING IT TO THE MELT STATE, AT A TEMPERATURE BETWEEN THE MELTING POINT OF THE POLYPROPYLENE AND 10* C. BELOW IT FOR A PERIOD SUFFICIENT TO BRING THE ENTIRE ARTICLE TO THE DESIRED TEMPERATURE AND NOT EXCEEDING 15 MINUTES AT SAID TEMPERATURE, AND THEREAFTER PERMITTING THE ARTICLE TO COOL AT A RATE EQUIVALENT TO COOLING IN A STILL GASEOUS ATMOSPHERE AT ROOM TEMPERATURE.
References Cited (Backward Citations)
US2990580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |