Patent US3114431A successfully refreshed from Google Patents.
US3114431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise attenuating apparatus of circular cross-section
Assignee: Beazer East Inc
•
Filing: 1962-08-15
•
Granted: 1963-12-17
•
Expires: 1982-08-15
Abstract
No abstract record available.
Inventors
- 👤 Guy J Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:11
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/02; F01N1/04; F01N2490/00; F01N2490/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1966-12-16 | 1967-06-17 | 1967-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-16 | 1971-06-17 | 1971-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-16 | 1975-06-17 | 1975-12-17 | $7700.00 | Window Closed / Lapsed |