US3118495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning heat exchangers
Assignee: Individual
•
Filing: 1957-11-12
•
Granted: 1964-01-21
•
Expires: 1977-11-12
Abstract
No abstract record available.
Inventors
- 👤 Hagby Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:52
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28D; F28D7/00; F28D7/10; F28D7/12; F28F1/00; F28F1/10; F28F1/12; F28F1/124; F28G; F28G1/00; F28G1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735658A
Cited
US1920800A
Cited
US2145084A
Cited
US2183496A
Cited
US2283208A
Cited
US2276527A
Cited
US2337294A
Cited
US2634164A
Cited
US2580470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |