US2667129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin diaphragm pump with stressrelieved diaphragms
Assignee: Dorr Co
•
Filing: 1952-06-19
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Granted: 1954-01-26
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Expires: 1972-06-19
Abstract
No abstract record available.
Inventors
- 👤 Frank L Graner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:36
CPC Classifications
F; F01; F01L; F01L23/00; F01L15/00; F01L15/08; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/073; F04B43/0736; F04B9/00; F04B9/08; F04B9/10; F04B9/109; F04B9/111; F04B9/115; Y; Y10; Y10S; Y10S417/00; Y10S417/90
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |