US3531447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur-vulcanizable copolymers of ethylene,propylene and 5 - (2'- and/or 3'-methyl - 2 - butenyl-) - norbornene - (2) and process for preparing them
Assignee: Hoechst AG
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Filing: 1967-03-16
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Granted: 1970-09-29
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Expires: 1987-03-16
Abstract
No abstract record available.
Inventors
- 👤 Albert Gustav Martin Gumboldt
- 👤 Jurgen Helberg
- 👤 Hans-Dieter Stemmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:59
CPC Classifications
C; C08; C08F; C08F210/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3093620A
Cited
US3349064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |