US3543528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of low-boiling gas mixtures
Assignee: Pullman Inc
•
Filing: 1967-08-01
•
Granted: 1970-12-01
•
Expires: 1987-08-01
Abstract
No abstract record available.
Inventors
- 👤 Duffer B Crawford
- 👤 Johannes C Norenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:52
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0257; F25J3/0204; F25J3/0219; F25J3/0233; F25J3/0252; F25J3/028; F25J3/0285; F25J2200/00; F25J2200/08; F25J2200/72; F25J2200/76; F25J2210/00; F25J2210/06; F25J2210/20; F25J2270/00; F25J2270/02; F25J2270/04; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/924; Y10S62/931; Y10S62/934
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2040112A
Cited
US2423274A
Cited
US2699046A
Cited
US2768940A
Cited
US2799628A
Cited
US2767133A
Cited
US2993342A
Cited
US2900312A
Cited
US3062016A
Cited
US3037359A
Cited
US2990690A
Cited
US3293869A
Cited
US3292380A
Cited
US3292381A
Cited
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 |