Patent US1937565A successfully refreshed from Google Patents.
US1937565A
Expired / Lapsed
US
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Control mechanism for water heating systems
Assignee: Individual
•
Filing: 1933-02-03
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Granted: 1933-12-05
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Expires: 1953-02-03
Abstract
No abstract record available.
Inventors
- 👤 William J Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:40
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/08; F24D19/082; F24D19/088; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7795; Y10T137/7809; Y10T137/7812; Y10T137/7813; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7923; Y10T137/794; Y10T137/8085
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) | 1936-12-04 | 1937-06-05 | 1937-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-04 | 1941-06-05 | 1941-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-04 | 1945-06-05 | 1945-12-05 | $7700.00 | Window Closed / Lapsed |