US3511624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing methane-containing gases
Assignee: Gas Council
•
Filing: 1967-02-20
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Granted: 1970-05-12
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Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Kelvin James Humphries
- 👤 Thomas Alan Yarwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:28
CPC Classifications
C; C10; C10K; C10K3/00; C10K3/02; C10K3/04; C07; C07C; C07C1/00; C07C1/02; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/755; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/934
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) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |