US3407871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Phillips Petroleum Co
•
Filing: 1966-07-25
•
Granted: 1968-10-29
•
Expires: 1986-07-25
Abstract
No abstract record available.
Inventors
- 👤 Penney William Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:57
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28F; F28F13/00; F28F13/06; F28F13/12; F28F13/125; Y; Y10; Y10S; Y10S159/00; Y10S159/15; Y10S165/00; Y10S165/072
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB347904A
Cited
US2070427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |