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US3011589A
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Method for producing exceptionally pure hydrogen
Assignee: MARK CHEMICAL Co Inc VAN
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Filing: 1960-03-21
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Granted: 1961-12-05
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Expires: 1980-03-21
Abstract
No abstract record available.
Inventors
- 👤 James R Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:36
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/506; F; F25; F25J; F25J3/00; F25J3/06; F25J3/063; F25J3/0655; F25J3/08; C01B2203/00; C01B2203/04; C01B2203/0465; C01B2203/047; C01B2203/0475; C01B2203/048; C01B2203/0495; F25J2205/00; F25J2205/40; F25J2205/60; F25J2210/00; F25J2210/42; F25J2215/00; F25J2215/10; F25J2270/00; F25J2270/90; F25J2270/904; Y; Y10; Y10S; Y10S62/00; Y10S62/931
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2224227A
Cited
US2882244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |