US2620893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for exhaust pipes of internal-combustion engines
Assignee: Individual
•
Filing: 1949-04-28
•
Granted: 1952-12-09
•
Expires: 1969-04-28
Abstract
No abstract record available.
Inventors
- 👤 Raymond B Holt
- 👤 Clarence H Rountree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:57
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1838; F01N13/1844; F01N13/1805; F01N13/1811; F01N3/00; F01N3/02; F01N2310/00; F01N2310/04; F01N2370/00; F01N2370/22; F01N2450/00; F01N2450/16; F01N2450/26; F01N2470/00; F01N2470/24; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |