US3531916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas dehydration
Assignee: Union Carbide Canada Ltd
•
Filing: 1968-05-15
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Granted: 1970-10-06
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Expires: 1988-05-15
Abstract
No abstract record available.
Inventors
- 👤 Robert J Kulperger
- 👤 Robert Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:22
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; B01D53/02; B01D53/04; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2257/00; B01D2257/80; B01D2258/00; B01D2258/06; B01D2259/00; B01D2259/40; B01D2259/40001; B01D2259/40003; B01D2259/40083; B01D2259/40088; B01D2259/4009; B01D2259/402
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) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |