US3404731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined exhaust silencer and heat exchanger
Assignee: PAUL A CUSHMAN
•
Filing: 1966-07-12
•
Granted: 1968-10-08
•
Expires: 1986-07-12
Abstract
No abstract record available.
Inventors
- 👤 Paul A Cushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:34
CPC Classifications
F; F01; F01N; F01N5/00; F01N5/02; F01N3/00; F01N3/02; F01N3/04; F01N3/043; F01N3/046; F28; F28D; F28D7/00; F28D7/04; F28F; F28F21/00; F28F21/06; F28F21/067; F01N1/00; F01N2240/00; F01N2240/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |