US3427138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process control system for making butyl rubber
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1963-10-07
•
Granted: 1969-02-11
•
Expires: 1983-10-07
Abstract
No abstract record available.
Inventors
- 👤 John F Donnelly
- 👤 Michael J Larsen
- 👤 William O Webber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:13
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2833750A
Cited
US2762568A
Cited
US2908734A
Cited
US3026184A
Cited
US3130187A
Cited
US3256262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |