US3279682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw air compressors
Assignee: James Howden and Co Ltd
•
Filing: 1964-02-20
•
Granted: 1966-10-18
•
Expires: 1984-02-20
Abstract
No abstract record available.
Inventors
- 👤 Hans B Vagenius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A SCREW COMPRESSOR COMPRISING A CASING, SIDE-BY-SIDE SHAFTS ROTATABLY MOUNTED IN THE CASING, AND TWO PAIRS OF SIDE-BY-SIDE INTERACTING MALE AND FEMALE ROTORS MOUNTED ON THE SHAFTS IN TANDEM AND CO-OPERATING WITH THE CASING, TO PROVIDE TWO COMPRESSION STAGES, WHEREIN THE OUTLETS OF BOTH STAGES ARE LOCATED AT OPPOSING ENDS OF THE ROTOR PAIRS, AND AT LEAST ONE OF THE SHAFTS CARRIES TWO ROTORS NAMELY ONE FROM EACH STAGE, AND IS SUPPORTED ON ONLY TWO BEARINGS ONE AT EACH END OF ONE OF THE ROTORS SO THAT THE OTHER ROTOR IS OVERHUNG.
Claim 2
Dependent Claim
92 words
A SCREW COMPRESSOR COMPRISING A CASING, SIDE-BY-SIDE SHAFTS ROTATABLY MOUNTED IN THE CASING, AND TWO PAIRS OF SIDE-BY-SIDE INTERACTING MALE AND FEMALE ROTORS MOUNTED ON THE SHAFTS IN TANDEM AND CO-OPERATING WITH THE CASING, TO PROVIDE TWO COMPRESSION STAGES, WHEREIN THE OUTLETS OF BOTH STAGES ARE LOCATED AT OPPOSING ENDS OF THE ROTOR PAIRS, AND AT LEAST ONE OF THE SHAFTS CARRIES TWO ROTORS NAMELY ONE FROM EACH STAGE, AND IS SUPPORTED ON ONLY TWO BEARINGS ONE AT EACH END OF ONE OF THE ROTORS SO THAT THE OTHER ROTOR IS OVERHUNG.
References Cited (Backward Citations)
US2009137A
Cited
GB464475A
Cited
US2533320A
Cited
US2847157A
Cited
US2975963A
Cited
US3084851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |