US1662659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulating valve
Assignee: VAPOR HEATING Co
•
Filing: 1927-04-23
•
Granted: 1928-03-13
•
Expires: 1947-04-23
Abstract
No abstract record available.
Inventors
- 👤 William W Birnstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:57
CPC Classifications
F; F16; F16K; F16K17/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7668; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759; Y10T137/86767; Y10T137/86775
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) | 1931-03-13 | 1931-09-12 | 1932-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-03-13 | 1935-09-12 | 1936-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-03-13 | 1939-09-12 | 1940-03-13 | $7700.00 | Window Closed / Lapsed |