Patent US3373218A successfully refreshed from Google Patents.
US3373218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ethylene and acetylene
Assignee: Individual
•
Filing: 1965-06-07
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Granted: 1968-03-12
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Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 Seymour C Schuman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:38
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/42; C07C5/46; C07C4/00; C07C4/02; C07C4/04; C07C5/48; C10; C10G; C10G9/00; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
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) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |