US3799103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stern drive unit trim tab
Assignee: Outboard Marine Corp
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Filing: 1972-06-26
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Granted: 1974-03-26
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Expires: 1992-06-26
Abstract
Abstract Disclosed herein is a stern drive lower unit comprising a lower portion which is at least partially submerged during normal operation and which includes a rotatably mounted propeller shaft carrying a propeller, and a trim tab which is located rearwardly and above the propeller and which includes two side surfaces, one of which is subject to thrust or impact by water propelled by the propeller and is provided with a forward portion and a rearward portion offset from the forward portion in the direction toward the other of the side surfaces.
Inventors
- 👤 L Granholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:02
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/42; B63H20/00; B63H20/32; B63H20/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A stern drive lower unit comprising a lower portion which is at least partially submerged during normal operation and which includes a rotatably mounted propeller shaft, a propeller carried on said propeller shaft for rotation therewith, and a trim tab which is located rearwardly and above said propeller shaft and which includes two side surfaces, one of said side surfaces being subject to impact by water propelled by said propeller and including a forward portion, a rearward portion offset from said forward portion in the direction toward the other of said side surfaces, and a step connecting said forward and rearward portions.
Claim 2
Dependent Claim
102 words
A stern drive lower unit comprising a lower portion which is at least partially submerged during normal operation and which includes a rotatably mounted propeller shaft, a propeller carried on said propeller shaft for rotation therewith, and a trim tab which is located rearwardly and above said propeller shaft and which includes two side surfaces, one of said side surfaces being subject to impact by water propelled by said propeller and including a forward portion, a rearward portion offset from said forward portion in the direction toward the other of said side surfaces, and a step connecting said forward and rearward portions.
Claim 3
Dependent Claim
34 words
A stern drive unit in accordance with claim 1 wherein said trim tab has a bottom margin and a rearward margin and an exhaust gas outlet in one of said bottom and rearward margins.
Claim 4
Dependent Claim
43 words
A stern drive unit in accordance with claim 1 wherein both said side surfaces are convexly outwardly curved and wherein the convex outer curvature of said other of said surfaces is greater than the convex outer curvature of said one of said surfaces.
Claim 5
Dependent Claim
38 words
A stern drive unit in accordance with claim 3 wherein said other of said surfaces has a forward portion and a rearward portion offset from said forward portion in the direction toward said one of said side surfaces.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |