US3530199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene production process
Assignee: Stone and Webster Engineering Corp
•
Filing: 1967-06-22
•
Granted: 1970-09-22
•
Expires: 1987-06-22
Abstract
No abstract record available.
Inventors
- 👤 Edgar G Lowrance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:41
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11; C07C7/005; Y; Y02; Y02P; Y02P30/00; Y02P30/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2250925A
Cited
US2830677A
Cited
US2886612A
Cited
US2805733A
Cited
US2942042A
Cited
US3153679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |