US3475329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorption of sulfur dioxide from mixtures with sulfolane
Assignee: Phillips Petroleum Co
•
Filing: 1966-03-21
•
Granted: 1969-10-28
•
Expires: 1986-03-21
Abstract
No abstract record available.
Inventors
- 👤 Donald M Little
- 👤 George R Hettick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; Y; Y10; Y10S; Y10S62/00; Y10S62/922
Claims Analysis
Total Claims: 0
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US3165539A
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US3161461A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |