Patent US4296704A successfully refreshed from Google Patents.
US4296704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-gravity spinnaker
Assignee: Individual
•
Filing: 1979-05-07
•
Granted: 1981-10-27
•
Expires: 1999-05-07
Abstract
Abstract This invention relates to an improved spinnaker which is lighter-than-air and designed to float ahead of the boat and to retain its shape when subject to wind variations.
Inventors
- 👤 John G. Bridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:04
CPC Classifications
B; B63; B63H; B63H9/00; B63H9/04; B63H9/08; B63H9/10; B63H9/1071
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A spinnaker large enough to aid a sailboat when sailing with the wind behind the boat, comprising: a piece of flexible sail fabric having a top end, a bottom end and at least two sides, an interior surface and an exterior surface; a plurality of tubular shaped inflatable bags of variable widths attached to the exterior surface of the fabric and containing a lighter-than-air gas; stabilizing lines extending from the corners of the interior surface of the fabric said lines joined above the surface of the fabric at about the mid-point of the interior surface; and means at three pointss on the spinnaker for attaching riggings from the spinnaker to both sides of the hull of the boat and to the top of the mast.
Claim 2
Dependent Claim
125 words
A spinnaker large enough to aid a sailboat when sailing with the wind behind the boat, comprising: a piece of flexible sail fabric having a top end, a bottom end and at least two sides, an interior surface and an exterior surface; a plurality of tubular shaped inflatable bags of variable widths attached to the exterior surface of the fabric and containing a lighter-than-air gas; stabilizing lines extending from the corners of the interior surface of the fabric said lines joined above the surface of the fabric at about the mid-point of the interior surface; and means at three pointss on the spinnaker for attaching riggings from the spinnaker to both sides of the hull of the boat and to the top of the mast.
Claim 3
Dependent Claim
70 words
The spinnaker of claim 1 wherein the inflatable bags are attached to the exterior surface of the fabric so that the sides of the bags are generally parallel to the top end and the bottom end of the fabric, at least one of the bags attached near the top end of the piece of fabric being wider than the bags attached near the bottom end of the piece of fabric.
Claim 4
Dependent Claim
23 words
The spinnaker of claim 2 wherein the interiors of the inflatable bags are interconnected so as to equalize the pressure within the bags.
Claim 5
Dependent Claim
44 words
The spinnaker of claim 1 wherein the inflatable bags are attached to the sides of the fabric, the bags attached to the sides near the bottom of the fabric being narrower than the bags attached to the sides near the top of the fabric.
Claim 6
Dependent Claim
24 words
The spinnaker of claim 1 wherein the lighter-than-air gas is selected from the group consisting of hydrogen, helium or heated air and mixtures thereof.
Claim 7
Dependent Claim
44 words
The spinnaker of claim 1 wherein the inflatable bags are attached to the exterior surface and to the sides of the fabric by a plurality of flexible connectors which allow the bags to float above the sides and the exterior surface of the fabric.
Claim 8
Dependent Claim
64 words
The spinnaker of claim 6 wherein the bags are curved and tapered in cross section such that the wider portion of the bag is attached to the top end of the fabric and the narrower portion of the bag is attached to the bottom end of the fabric and the bag conforms generally to the curvature of the fabric when the sail is filled.
Claim 9
Dependent Claim
16 words
The spinnaker of claim 1 wherein the inflatable bags are constructed from a heat absorbing material.
References Cited (Backward Citations)
US2159923A
Cited
US2208786A
Cited
US2486158A
Cited
US3003722A
Cited
US3174453A
Cited
US3356059A
Cited
US3391668A
Cited
US3455261A
Cited
US3720180A
Cited
US3791611A
Cited
US3851612A
Cited
US4164193A
Cited
US4178867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |