Patent US4326499A successfully refreshed from Google Patents.
Patent US2975976A successfully refreshed from Google Patents.
US2975976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro pneumatic temperature control system
Assignee: Vapor Heating Corp
•
Filing: 1957-05-31
•
Granted: 1961-03-21
•
Expires: 1977-05-31
Abstract
No abstract record available.
Inventors
- 👤 Robert P Smith
- 👤 Joseph A Christ
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:12
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1925; G05D16/00; G05D16/20; G05D16/2093; G05D16/2095; G05D16/2097; G05D23/20; G05D23/24; G05D23/2451; G05D23/2456; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7832
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US623873A
Cited
US2118248A
Cited
US2220176A
Cited
US2171348A
Cited
US2315775A
Cited
US2403917A
Cited
US2389082A
Cited
US2710724A
Cited
GB736985A
Cited
US2742916A
Cited
FR1096839A
Cited
US2810526A
Cited
US2729394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |