Patent US3021605A successfully refreshed from Google Patents.
US3021605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater system
Assignee: Hamilton Manufacturing Co
•
Filing: 1957-07-19
•
Granted: 1962-02-20
•
Expires: 1977-07-19
Abstract
No abstract record available.
Inventors
- 👤 Lehman E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:37
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; D; D06; D06F; D06F34/00; D06F34/08; D06F2101/00; D06F2101/14; D06F2103/00; D06F2103/28; D06F2103/32; D06F2105/00; D06F2105/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2307294A
Cited
US2621423A
Cited
US2678814A
Cited
US2789367A
Cited
US2827276A
Cited
US2769246A
Cited
US2819540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |