Patent US3040974A successfully refreshed from Google Patents.
US3040974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary vacuum pumps
Assignee: Basic Products Corp
•
Filing: 1956-12-11
•
Granted: 1962-06-26
•
Expires: 1976-12-11
Abstract
No abstract record available.
Inventors
- 👤 William M Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:57
CPC Classifications
F; F04; F04C; F04C25/00; F04C18/00; F04C18/30; F04C18/34; F04C18/344; Y; Y10; Y10S; Y10S277/00; Y10S277/91; Y10S418/00; Y10S418/01
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |