US3030938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot water boiler for a heating system
Assignee: Individual
•
Filing: 1957-06-19
•
Granted: 1962-04-24
•
Expires: 1977-06-19
Abstract
No abstract record available.
Inventors
- 👤 Vorkauf Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:59
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F24H1/406; F22; F22B; F22B21/00; F22B21/34; F22B21/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |