US2952218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1958-09-09
•
Granted: 1960-09-13
•
Expires: 1978-09-09
Abstract
No abstract record available.
Inventors
- 👤 Adam P G Steffes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/04; F04B39/041; F04B39/044; F04B43/00; F04B43/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1445844A
Cited
GB348013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |