Patent US3544653A successfully refreshed from Google Patents.
US3544653A
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Preparation of olefin feeds for acid recovery processes
Assignee: STRATFORD ENG CORP
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Filing: 1969-05-09
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Granted: 1970-12-01
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Expires: 1989-05-09
Abstract
No abstract record available.
Inventors
- 👤 Orlando Webb Jr
- 👤 Ward A Graham
- 👤 Harry E Massa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:20
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C7/00; C07C7/148; C07C7/17; C07C7/171; C07C9/00; C07C9/14; C07C9/16; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |