Patent US3429679A successfully refreshed from Google Patents.
US3429679A
Expired / Lapsed
US
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Process for improving the heating values of fuel gases
Assignee: United States Department of the Interior
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Filing: 1965-06-07
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Granted: 1969-02-25
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Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 Sam Friedman
- 👤 Raymond W Hiteshue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:04
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/02; C07C1/12; C07C1/04; C07C1/0425; C07C1/043; C07C1/0455; C07C1/046; C07C2527/00; C07C2527/02; C07C2527/04; C07C2527/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2029895A
Cited
DE1085287B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |