US2639855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable vacuum and pressure rotary pump
Assignee: Individual
•
Filing: 1948-02-06
•
Granted: 1953-05-26
•
Expires: 1968-02-06
Abstract
No abstract record available.
Inventors
- 👤 William T Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:28
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/12; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C18/3441; F04C18/3442
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE285468C
Cited
US1016017A
Cited
US1374650A
Cited
US1776921A
Cited
US1736666A
Cited
US1769647A
Cited
GB388990A
Cited
US2044873A
Cited
US2178425A
Cited
FR850991A
Cited
US2275774A
Cited
US2216053A
Cited
US2324903A
Cited
US2439241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |