US3510405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isoprene purification process
Assignee: Zeon Corp
•
Filing: 1968-11-07
•
Granted: 1970-05-05
•
Expires: 1988-11-07
Abstract
No abstract record available.
Inventors
- 👤 Susumu Takao
- 👤 Takeo Koide
- 👤 Iwaki Nishitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:39
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/952
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2387993A
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US2600106A
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US3013952A
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US3320138A
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US3317627A
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US3344198A
Cited
US3301915A
Cited
US3350282A
Cited
US3350283A
Cited
US3439060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |