US2993432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calender air doctor
Assignee: Beloit Iron Works Inc
•
Filing: 1958-01-14
•
Granted: 1961-07-25
•
Expires: 1978-01-14
Abstract
No abstract record available.
Inventors
- 👤 Casper E Youngchild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:22
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/06; D21G; D21G3/00; D21G3/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US485534A
Cited
US600518A
Cited
US1326615A
Cited
US680135A
Cited
US1714261A
Cited
US1982571A
Cited
US2130241A
Cited
US2184908A
Cited
US2190941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |