Patent US3605408A successfully refreshed from Google Patents.
Patent US2429291A successfully refreshed from Google Patents.
US3515519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for electric arc-cracking of hydrocarbons
Assignee: Knapsack AG
•
Filing: 1967-08-03
•
Granted: 1970-06-02
•
Expires: 1987-08-03
Abstract
No abstract record available.
Inventors
- 👤 Kurt Sennewald
- 👤 Ludwig Bender
- 👤 Klaus Gehrmann
- 👤 Heinrich Kallrath
- 👤 Gunter Peantek
- 👤 Erich Schallus
- 👤 Hans-Werner Stephan
- 👤 Lothar Strie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:46
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/342; C10; C10G; C10G15/00; C10G15/12; C10G47/00; C10G9/00; C10G9/34; C10G9/36; Y; Y10; Y10S; Y10S585/00; Y10S585/909; Y10S585/911; Y10S585/913; Y10S585/919; Y10S585/921; Y10S585/922; Y10S585/923; Y10S585/949; Y10S585/953; Y10S585/955
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3114691A
Cited
US3377402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |