Patent US3703442A successfully refreshed from Google Patents.
Patent US2197603A successfully refreshed from Google Patents.
US2197603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heating unit
Assignee: Individual
•
Filing: 1938-01-29
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Granted: 1940-04-16
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Expires: 1958-01-29
Abstract
No abstract record available.
Inventors
- 👤 Roy H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:02
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F22; F22B; F22B21/00; F22B21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-04-16 | 1943-10-16 | 1944-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-16 | 1947-10-16 | 1948-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-16 | 1951-10-16 | 1952-04-16 | $7700.00 | Window Closed / Lapsed |