US2339487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time and volume control for gas
Assignee: —
•
Filing: —
•
Granted: 1944-01-18
•
Expires: 1961-01-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:43
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; Y; Y10; Y10S; Y10S411/00; Y10S411/918; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7769; Y10T137/777; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788; Y10T137/7793; Y10T137/7822; Y10T137/7828; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86493
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) | 1947-01-17 | 1947-07-19 | 1948-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-01-17 | 1951-07-19 | 1952-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-01-17 | 1955-07-19 | 1956-01-18 | $7700.00 | Window Closed / Lapsed |