Patent US4617134A successfully refreshed from Google Patents.
Patent US3097838A successfully refreshed from Google Patents.
US3097838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic heat transfer type air damper
Assignee: Individual
•
Filing: 1961-02-27
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Granted: 1963-07-16
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Expires: 1981-02-27
Abstract
No abstract record available.
Inventors
- 👤 Zenas B Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:01
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/02; F16F9/0209; F41; F41F; F41F3/00; F41F3/04; F41F3/073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A GAS FILLED SHOCK ABSORBER FOR USE IN DAMPING THE RELATIVE MOVEMENT OF TWO MEMBERS COMPRISING, A HOUSING ENCLOSING A WORKING CHAMBER WHEREIN IS CONTAINED A PISTON IN SLIDABLE ENGAGEMENT HAVING A CONNECTING MEANS ATTACHED THERETO AND EXTENDING THROUGH AN END OF SAID HOUSING, A HEAT EXCHANGING PASSAGE EXTERNAL OF SAID CHAMBER FORMING A CONNECTION BETWEEN THE OPPOSITE ENDS OF SAID WORKING CHAMBER, A SECOND CHAMBER SURROUNDING SAID HEAT EXCHANGING PASSAGE HAVING MEANS FOR CIRCULATING
Claim 2
Dependent Claim
75 words
A GAS FILLED SHOCK ABSORBER FOR USE IN DAMPING THE RELATIVE MOVEMENT OF TWO MEMBERS COMPRISING, A HOUSING ENCLOSING A WORKING CHAMBER WHEREIN IS CONTAINED A PISTON IN SLIDABLE ENGAGEMENT HAVING A CONNECTING MEANS ATTACHED THERETO AND EXTENDING THROUGH AN END OF SAID HOUSING, A HEAT EXCHANGING PASSAGE EXTERNAL OF SAID CHAMBER FORMING A CONNECTION BETWEEN THE OPPOSITE ENDS OF SAID WORKING CHAMBER, A SECOND CHAMBER SURROUNDING SAID HEAT EXCHANGING PASSAGE HAVING MEANS FOR CIRCULATING
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) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |