Patent US3204870A successfully refreshed from Google Patents.
US3204870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating apparatus for heating systems
Assignee: Individual
•
Filing: 1962-12-26
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Granted: 1965-09-07
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Expires: 1982-12-26
Abstract
No abstract record available.
Inventors
- 👤 Dibert Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:57
CPC Classifications
F; F24; F24D; F24D5/00; Y; Y10; Y10S; Y10S454/00; Y10S454/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A DAMPER ASSEMBLY COMPRISING CONDUIT MEANS OPEN AT BOTH ENDS; DAMPER MEANS INCLUDING A PART FORMED OF MAGNETICALLY ATTRACTIVE MATERIAL; MEANS ECCENTRICALLY MOUNTING SAID DAMPER MEANS ON SAID CONDIUT MEANS FOR MOVEMENT BY GRAVITY FROM A POSITION OPENING SAID CONDUIT MEANS TO A POSITION CLOSING SAID CONDUIT MEANS, AND RETURN; AND PERMANENT MAGNET MEANS EXERTING A MAGNETIC FORCE ON SAID PART WHEN SAID DAMPER MEANS IS IN SAID CLOSING POSITION FOR RELEASABLY HOLDING SAID DAMPER MEANS IN SAID CLOSING POSITION AND YIELDABLY RESISTING MOVEMENT OF SAID DAMPER MEANS TO SAID OPENING POSITION.
Claim 2
Dependent Claim
92 words
A DAMPER ASSEMBLY COMPRISING CONDUIT MEANS OPEN AT BOTH ENDS; DAMPER MEANS INCLUDING A PART FORMED OF MAGNETICALLY ATTRACTIVE MATERIAL; MEANS ECCENTRICALLY MOUNTING SAID DAMPER MEANS ON SAID CONDIUT MEANS FOR MOVEMENT BY GRAVITY FROM A POSITION OPENING SAID CONDUIT MEANS TO A POSITION CLOSING SAID CONDUIT MEANS, AND RETURN; AND PERMANENT MAGNET MEANS EXERTING A MAGNETIC FORCE ON SAID PART WHEN SAID DAMPER MEANS IS IN SAID CLOSING POSITION FOR RELEASABLY HOLDING SAID DAMPER MEANS IN SAID CLOSING POSITION AND YIELDABLY RESISTING MOVEMENT OF SAID DAMPER MEANS TO SAID OPENING POSITION.
References Cited (Backward Citations)
US1875511A
Cited
US1993069A
Cited
US2016485A
Cited
US1943342A
Cited
US2116911A
Cited
US2222663A
Cited
US2702504A
Cited
US2743056A
Cited
US2962218A
Cited
US3009643A
Cited
US3102748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |