US1576608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam-heating system
Assignee: Individual
•
Filing: 1924-06-23
•
Granted: 1926-03-16
•
Expires: 1944-06-23
Abstract
No abstract record available.
Inventors
- 👤 Helphingstine Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:11
CPC Classifications
F; F24; F24D; F24D1/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2937; Y10T137/294; Y10T137/2947; Y10T137/6416; Y10T137/6851; Y10T137/7287; Y10T137/7297; Y10T137/7303; Y10T137/7722; Y10T137/7738; Y10T137/7758; Y10T137/7762; Y10T137/7781; Y10T137/7782; Y10T137/7837; Y10T137/7897; Y10T137/8158; Y10T137/8342; Y10T137/8593; Y10T137/86292; Y10T137/86348; Y10T137/87917
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) | 1929-03-15 | 1929-09-14 | 1930-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-03-15 | 1933-09-14 | 1934-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-03-15 | 1937-09-14 | 1938-03-16 | $7700.00 | Window Closed / Lapsed |