US3721071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed and grounded electric motor housing
Assignee: Individual
•
Filing: 1971-08-20
•
Granted: 1973-03-20
•
Expires: 1991-08-20
Abstract
Abstract AN ELECTRIC MOTOR HOUSING FOR A VACUUM TYPE APPARATUS THAT REQUIRES THE MOTOR TO BE SEALED AGAINST DIRT, DUST, AND DEBRIS AND COMPLETELY ELECTRICALLY GROUNDED, INCLUDING A FILTER SUPPORT MOUNTED UPON AN ELECTRIC MOTOR WHICH IS IN TURN CONFINED WITHIN A METAL PROTECTIVE SLEEVE INCLUDING PERIPHERAL GASKETS FOR SEALING THE SLEEVE BETWEEN THE MOTOR CASTING AND THE APPARATUS COVER, WITH THE SLEEVE PROVIDING AN INTEGRAL YIELDABLE GROUNDING LUG FOR CONNECTION TO THE MOTOR AND GRUNDNG WIRE OF THE ELECTRICAL SUPPLY CORD. D R A W I N G
Inventors
- 👤 H Mueller
- 👤 L Purcell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:07
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/28; A47L9/2889; Y; Y10; Y10S; Y10S55/00; Y10S55/03
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |