US3103978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch marine screw propellers
Assignee: Slack and Parr Marine Ltd
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Filing: 1961-09-22
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Granted: 1963-09-17
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Expires: 1981-09-22
Abstract
No abstract record available.
Inventors
- 👤 Chadwick James Alexander
- 👤 Mason David Dexter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:51
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/02; B63H3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A VARIABLE PITCH MARINE SCREW PROPELLER COMPRISING A HUB, A SEPARATE PROPELLER BLADE BEARING RING MOUNTED IN A RECESS IN SAID HUB, SAID RECESS HAVING A THROUGH BORE, A PLURALITY OF RADIALLY PROJECTING PROPELLER BLADE AND CRANK DISC ASSEMBLIES ROTATABLY MOUNTED IN SAID HUB FOR PITCH VARYING MOVEMENT AND ONE OF WHICH IS MOUNTED IN SAID BEARING RING, AND A CROSSHEAD SLIDABLY MOUNTED IN SAID HUB BETWEEN SAID ASSEMBLIES AND IN ENGAGEMENT WITH SAID CRANK DISCS WHEREBY SLIDING MOVEMENT OF THE CROSSHEAD PRODUCES PITCH VARYING MOVEMENT OF SAID BLADES, THE DIMENSIONS OF SAID BORE BEING SUCH THAT THE CROSSHEAD CAN BE INSERTED AND FITTED WITHIN THE HUB THROUGH SAID BORE BEFORE SAID BEARING RING TOGETHER WITH SAID ONE ASSEMBLY IS FITTED IN SAID RECESS.
Claim 2
Dependent Claim
124 words
A VARIABLE PITCH MARINE SCREW PROPELLER COMPRISING A HUB, A SEPARATE PROPELLER BLADE BEARING RING MOUNTED IN A RECESS IN SAID HUB, SAID RECESS HAVING A THROUGH BORE, A PLURALITY OF RADIALLY PROJECTING PROPELLER BLADE AND CRANK DISC ASSEMBLIES ROTATABLY MOUNTED IN SAID HUB FOR PITCH VARYING MOVEMENT AND ONE OF WHICH IS MOUNTED IN SAID BEARING RING, AND A CROSSHEAD SLIDABLY MOUNTED IN SAID HUB BETWEEN SAID ASSEMBLIES AND IN ENGAGEMENT WITH SAID CRANK DISCS WHEREBY SLIDING MOVEMENT OF THE CROSSHEAD PRODUCES PITCH VARYING MOVEMENT OF SAID BLADES, THE DIMENSIONS OF SAID BORE BEING SUCH THAT THE CROSSHEAD CAN BE INSERTED AND FITTED WITHIN THE HUB THROUGH SAID BORE BEFORE SAID BEARING RING TOGETHER WITH SAID ONE ASSEMBLY IS FITTED IN SAID RECESS.
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) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |