US2820472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable valve-actuating means
Assignee: Individual
•
Filing: 1955-02-08
•
Granted: 1958-01-21
•
Expires: 1975-02-08
Abstract
No abstract record available.
Inventors
- 👤 Spence Paulsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:30
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/04; F; F16; F16K; F16K31/00; F16K31/12; F16K31/18; F16K31/20; F16K31/24; F16K31/26; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/777; Y10T137/7837; Y10T137/7904; Y10T137/7906; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735669A
Cited
US1162693A
Cited
US1995949A
Cited
US1930027A
Cited
US2060723A
Cited
US2431283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |