Patent US3512607A successfully refreshed from Google Patents.
US3512607A
Expired / Lapsed
US
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Co-axial tuning tubes for muffler
Assignee: Tenneco Inc
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Filing: 1969-07-18
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Granted: 1970-05-19
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Expires: 1989-07-18
Abstract
No abstract record available.
Inventors
- 👤 Franklin R Hubbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:11
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/02; F01N1/08; F01N1/084; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR49088E
Cited
US3209858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |