Patent US2933239A successfully refreshed from Google Patents.
US2933239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas compressor
Assignee: MCDONALD L STEPHENS
•
Filing: 1957-12-06
•
Granted: 1960-04-19
•
Expires: 1977-12-06
Abstract
No abstract record available.
Inventors
- 👤 Blackman Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:00
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/30; F04C18/38; F04C18/39; F04C18/32; F04C18/322; F25; F25B; F25B1/00; F25B1/04; F04C18/34; F04C18/344
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US448336A
Cited
US1660183A
Cited
US1961592A
Cited
US1914622A
Cited
US1935096A
Cited
US2061950A
Cited
US2029554A
Cited
DE861204C
Cited
US2789513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |