Patent US3451031A successfully refreshed from Google Patents.
US2961222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Trane Co
•
Filing: 1957-12-06
•
Granted: 1960-11-22
•
Expires: 1977-12-06
Abstract
No abstract record available.
Inventors
- 👤 Alan G Butt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:08
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0031; F28D9/0037; F28F; F28F3/00; F28F3/02; F28F3/025; F28F2275/00; F28F2275/06; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/387; Y10S165/391
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE382437C
Cited
US1686614A
Cited
USRE20139E
Cited
US2143269A
Cited
US2222721A
Cited
US2368814A
Cited
US2539870A
Cited
US2591878A
Cited
US2782010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |