US3489350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatically controlled burner valve with high and low feed rates
Assignee: Robertshaw Controls Co
•
Filing: 1969-02-03
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Granted: 1970-01-13
•
Expires: 1989-02-03
Abstract
No abstract record available.
Inventors
- 👤 Michael J Caparone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:01
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/025; F23N5/06; F23N5/067; F23N2235/00; F23N2235/12; F23N2235/20; F23N2235/24
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) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |