Patent US3420642A successfully refreshed from Google Patents.
US3420642A
Expired / Lapsed
US
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Production of gases containing methane from hydrocarbons
Assignee: Gas Council
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Filing: 1964-03-30
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Granted: 1969-01-07
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Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 George Percival
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:09
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/20; C10G11/22; C07; C07C; C07C9/00; C07C9/02; C07C9/04; C10G2400/00; C10G2400/26
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |