US3249240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Draft gear
Assignee: Individual
•
Filing: 1964-04-21
•
Granted: 1966-05-03
•
Expires: 1984-04-21
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G Empson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:50
CPC Classifications
B; B61; B61G; B61G9/00; B61G9/04; B61G9/08; F; F16; F16F; F16F13/00; F16F13/04; F16F13/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A DRAFT GEAR FOR RAILROAD DRAFT RIGGING, SAID DRAFT GEAR FITTING WITH THE POCKET OF A RAILROAD CAR COMPRISING IN COMBINATION: (A) FIRST END PLATE; (B) A SECOND END PLATE; (C) A HYDRAULIC CYLINDER ATTACHED TO THE FIRST END PLATE; (D) A FIRST PISTON IN THE HYDRAULIC CYLINDER; (E) A PLURALITY OF RUBBER SPRINGS BETWEEN THE FIRST AND SECOND END PLATES, SAID SPRINGS HAVING HOLLOW CENTERS; (F) A HOLLOW PISTON ROD ATTACHED TO THE FIRST PISTON AT ONE END THEREOF AND ATTACHED TO THE SECOND END PLATE AT THE OTHER END THEREOF, SAID PISTON ROD FITTING WITH THE HOLLOW CENTERS OF THE RUBBER SPRINGS; (G) A HYDRAULIC FLUID IN THE HYDRAULIC CYLINDER; (H) A GAS IN THE HOLLOW PISTON ROD; (I) SAID FIRST PISTON FORMING A LOOSE FIT IN SAID HYDRAULIC CYLINDER WHEREBY SAID HYDRAULIC FLUID CAN BE CAUSED TO FLOW AROUND THE EDGES OF SAID CYLINDER; (J) MEANS WHEREBY THE HYDRAULIC FLUID CAN FLOW FROM THE CYLINDER INTO THE HOLLOW PISTON ROD, THEREBY COMPRESSING THE GAS; (K) AND MEANS FOR KEEPING THE HYDRAULIC FLUID FROM MIXING WITH THE GAS.
Claim 2
Dependent Claim
180 words
A DRAFT GEAR FOR RAILROAD DRAFT RIGGING, SAID DRAFT GEAR FITTING WITH THE POCKET OF A RAILROAD CAR COMPRISING IN COMBINATION: (A) FIRST END PLATE; (B) A SECOND END PLATE; (C) A HYDRAULIC CYLINDER ATTACHED TO THE FIRST END PLATE; (D) A FIRST PISTON IN THE HYDRAULIC CYLINDER; (E) A PLURALITY OF RUBBER SPRINGS BETWEEN THE FIRST AND SECOND END PLATES, SAID SPRINGS HAVING HOLLOW CENTERS; (F) A HOLLOW PISTON ROD ATTACHED TO THE FIRST PISTON AT ONE END THEREOF AND ATTACHED TO THE SECOND END PLATE AT THE OTHER END THEREOF, SAID PISTON ROD FITTING WITH THE HOLLOW CENTERS OF THE RUBBER SPRINGS; (G) A HYDRAULIC FLUID IN THE HYDRAULIC CYLINDER; (H) A GAS IN THE HOLLOW PISTON ROD; (I) SAID FIRST PISTON FORMING A LOOSE FIT IN SAID HYDRAULIC CYLINDER WHEREBY SAID HYDRAULIC FLUID CAN BE CAUSED TO FLOW AROUND THE EDGES OF SAID CYLINDER; (J) MEANS WHEREBY THE HYDRAULIC FLUID CAN FLOW FROM THE CYLINDER INTO THE HOLLOW PISTON ROD, THEREBY COMPRESSING THE GAS; (K) AND MEANS FOR KEEPING THE HYDRAULIC FLUID FROM MIXING WITH THE GAS.
References Cited (Backward Citations)
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Cited
US3031089A
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US3033384A
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US3135394A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |