US2761950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic dual temperature heating system
Assignee: STANLEY HOFFMAN
•
Filing: 1952-07-02
•
Granted: 1956-09-04
•
Expires: 1972-07-02
Abstract
No abstract record available.
Inventors
- 👤 Frank P Tagliaferri
- 👤 Francis T Gier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; G05D23/27535; G05D23/27537; F; F24; F24H; F24H3/00; F24H3/002; F24H3/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1167613A
Cited
US1369702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |