US3497674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for direct electrical heating of gaseous substances
Assignee: Bayer AG
•
Filing: 1967-12-26
•
Granted: 1970-02-24
•
Expires: 1987-12-26
Abstract
No abstract record available.
Inventors
- 👤 Hans Zirngibl
- 👤 Karl Brandle
- 👤 Karl Engel
- 👤 Walter Weidmann
- 👤 Peter Beumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1410566A
Cited
US679973A
Cited
US654467A
Cited
US2235401A
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US2563115A
Cited
US2670426A
Cited
US3136836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |