Patent US4660498A successfully refreshed from Google Patents.
US4660498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reinforcing flexible plastic
Assignee: MASTER CRAFT BOAT Co (TN CORPORATION)
•
Filing: 1984-05-22
•
Granted: 1987-04-28
•
Expires: 2004-05-22
Abstract
Abstract Flexible plastic such as polyethylene is reinforced by molding the plastic over a reinforcing member. The reinforcing member is provided with at least one undercut between the plastic and the mold, and the plastic is molded into the undercut so that the plastic and the reinforcing member are interconnected.
Inventors
- 👤 George B. Madison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:37
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/12; B29C70/00; B29C70/88; B29C70/887; B63; B63B; B63B5/00; B63B5/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A method of reinforcing a molded plastic canoe comprising the steps of: (a) placing an elongated relatively rigid reinforcing member on a vacuum mold for the canoe, the reinforcing member providing a pair of undercuts between the top of the reinforcing member and the portion of the mold which supports the reinforcing member, (b) placing a heated plastic sheet over the reinforcing member and the mold, (c) drawing a vacuum between the plastic sheet and the mold and molding the plastic sheet about the reinforcing member and the mold so that a portion of the plastic sheet extends into the undercuts and the remainder of the plastic sheet is molded in the shape of a canoe, and (d) inserting an elongated keel member into a slot which is provided in the canoe by the portion of the plastic sheet which extends into the undercuts of the reinforcing member.
Claim 2
Independent Claim
148 words
A method of reinforcing a molded plastic canoe comprising the steps of: (a) placing an elongated relatively rigid reinforcing member on a vacuum mold for the canoe, the reinforcing member providing a pair of undercuts between the top of the reinforcing member and the portion of the mold which supports the reinforcing member, (b) placing a heated plastic sheet over the reinforcing member and the mold, (c) drawing a vacuum between the plastic sheet and the mold and molding the plastic sheet about the reinforcing member and the mold so that a portion of the plastic sheet extends into the undercuts and the remainder of the plastic sheet is molded in the shape of a canoe, and (d) inserting an elongated keel member into a slot which is provided in the canoe by the portion of the plastic sheet which extends into the undercuts of the reinforcing member.
References Cited (Backward Citations)
US2876498A
Cited
US2807811A
Cited
US3070817A
Cited
GB1003032A
Cited
US3611461A
Cited
JPS5130867A
Cited
US4323411A
Cited
US4307059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |