US3391963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable diaphragm pump
Assignee: Handley Weeks Inc
•
Filing: 1967-02-06
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Granted: 1968-07-09
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Expires: 1987-02-06
Abstract
No abstract record available.
Inventors
- 👤 Wyatt J Weeks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:28
CPC Classifications
F; F04; F04B; F04B45/00; F04B45/04; F04B45/053; F04B45/0536; B; B65; B65G; B65G53/00; B65G53/04; B65G53/16; F04B43/00; F04B43/0009; F04B43/0054; F04B9/00; F04B9/08; F04B9/12; F04B9/1207; B05; B05B; B05B7/00; B05B7/14; B05B7/1404; B05B7/1459; B65G2812/00; B65G2812/16; B65G2812/1608; B65G2812/1675
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |