US4489028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kayak improvements
Assignee: Individual
•
Filing: 1982-11-22
•
Granted: 1984-12-18
•
Expires: 2002-11-22
Abstract
Abstract The kayak improvements include a method for embedding a nut in the material of a kayak hull during a rotational molding process and structure for use with such an embedded nut to hold a frame in place.
Inventors
- 👤 William E. Masters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:39
CPC Classifications
B; B63; B63B; B63B5/00; B63B5/24; B29; B29C; B29C33/00; B29C33/12; B29C41/00; B29C41/02; B29C41/20; B29C41/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A method of attaching an element to the inner surface of a rotationally molded structure, comprising: connecting said element to one end of an elongated heat conductive member; attached said heat conductive member to a mold for producing said structure such that said element is spaced from said mold by a distance sufficient to permit mold material to flow between said element and said mold; rotationally molding said structure by heating said mold, filling said mold with mold material, and rotating said mold, whereby heat from said mold is transferred through said heat conductive member to said element and causes said mold material to melt around and adhere to said element when taking the shape of said mold; removing said member from said molded structure by cutting a portion out of said molded structure around said member and disconnecting said element from said heat conductive member.
Claim 2
Independent Claim
146 words
A method of attaching an element to the inner surface of a rotationally molded structure, comprising: connecting said element to one end of an elongated heat conductive member; attached said heat conductive member to a mold for producing said structure such that said element is spaced from said mold by a distance sufficient to permit mold material to flow between said element and said mold; rotationally molding said structure by heating said mold, filling said mold with mold material, and rotating said mold, whereby heat from said mold is transferred through said heat conductive member to said element and causes said mold material to melt around and adhere to said element when taking the shape of said mold; removing said member from said molded structure by cutting a portion out of said molded structure around said member and disconnecting said element from said heat conductive member.
Claim 3
Dependent Claim
25 words
The method of claim 1, wherein said element is threaded and said member is connected to said element by screwing said element onto said member.
Claim 4
Dependent Claim
56 words
The method of claim 1, wherein said structure is a kayak and said member is connected to said mold at a position to be occupied by the kayak cockpit opening, and said element is removed from the molded kayak after having been disconnected from said element by cutting said molded structure to form said cockpit opening.
Claim 5
Dependent Claim
45 words
The method of claim 1, wherein said member is connected to said mold to include an exposed portion extending out of said mold and the amount of heat transferred to said element is adjusted by attaching cooling surfaces to the exposed portion of said member.
References Cited (Backward Citations)
US2918703A
Cited
US3299501A
Cited
US4023257A
Cited
US4143193A
Cited
US4214670A
Cited
US4357293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |