US3134542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic temperature control
Assignee: Individual
•
Filing: 1961-06-30
•
Granted: 1964-05-26
•
Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Smith Wardell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:04
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1003
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
IN A ONE PIPE STEAM HEATING SYSTEM HAVING A PLURALITY OF STEAM RADIATORS DISPOSED IN A PLURALITY OF DIFFERENT ZONES, AND A COMMON SOURCE OF STEAM FOR SAID RADIATORS FOR HEATING SAID ZONES, THE IMPROVEMENT COMPRISING AN ELECTRICALLY OPERATED VALVE CONNECTED TO EACH RADIATOR FOR CONTROLLING THE FLOW OF AIR THEREFROM, EACH VALVE BEING OPEN WHEN ELECTRICALLY DE-ENERGIZED AND HAVING MEANS FORMING AN AIR-OUTLET PASSAGE, A RESILIENT DIAPHRAGM OVER SAID PASSAGE, A HEAT-SENSING DEVICE ENGAGING SAID DIAPHRAGM, AND ADJUSTING MEANS FOR SAID DEVICE AND DIAPHRAGM.
References Cited (Backward Citations)
US885683A
Cited
US1658104A
Cited
US2038435A
Cited
US2177649A
Cited
US2401025A
Cited
US2860850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |