Patent US3876486A successfully refreshed from Google Patents.
US3876486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealing of plastic sheets
Assignee: Individual
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Filing: 1973-12-06
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Granted: 1975-04-08
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Expires: 1993-12-06
Abstract
Abstract The heat bonding of plastic sheets includes the steps: A. transmitting high frequency electrical energy in one direction through a first portion of said sheets of sufficient area as to preclude heat bonding of the sheets at said first portion thereof, and B. transmitting said energy back through a second portion of the sheets and of sufficiently reduced area as to effect heating bonding of the sheets at said second portion.
Inventors
- 👤 William Pennington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:32
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/82; B29C66/824; B29C66/8242; B29C66/82421; B29C65/00; B29C65/02; B29C65/04; B29C65/74; B29C65/743; B29C65/7441; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/24; B29C66/242; B29C66/2424; B29C66/24243; B29C66/24244; B29C66/40; B29C66/41; B29C66/43; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/83; B29C66/832; B29C66/8322; B29C66/70; B29C66/71; B29L; B29L2031/00; B29L2031/705; B29L2031/7052; Y; Y10; Y10S; Y10S5/00; Y10S5/932
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
In the process of heat bonding plastic layers, the combination comprising a. a zone to receive said layers, b. feed through capacitor plates respectively located at opposite sides of said zone and of a size to pass high frequency electrical energy therebetween and through said layers without significant softening of the layers, c. means to feed said energy to one of said plates, and d. means electrically connected to the other of said plates to receive
Claim 2
Dependent Claim
76 words
In the process of heat bonding plastic layers, the combination comprising a. a zone to receive said layers, b. feed through capacitor plates respectively located at opposite sides of said zone and of a size to pass high frequency electrical energy therebetween and through said layers without significant softening of the layers, c. means to feed said energy to one of said plates, and d. means electrically connected to the other of said plates to receive
Claim 3
Dependent Claim
23 words
The combination of claim 1 including a platen supporting said other plate and relatively movable toward said zone to bring said feed through
Claim 4
Dependent Claim
11 words
The combination of claim 2 wherein said means includes die structure
Claim 5
Dependent Claim
51 words
The combination of claim 3 wherein said mean includes auxiliary plates at opposite sides of said zone, one of said auxiliary plates at the same side of said zone as said one feed through capacitor plate, and the other of said auxiliary plates at the opposite side of said zone and
Claim 6
Dependent Claim
32 words
The combination of claim 4 wherein the electrical connection of the other auxiliary plate with the other feed through plate is defined by flexible metallic straps extending generally laterally outwardly away from
Claim 7
Dependent Claim
49 words
The combination of claim 5 wherein said other feed through plate is supported by the platen to float relative thereto to permit seating of said other feed through plate on said plastic layers followed by limited bodily movement of the platen toward the plastic layers to bring the die
Claim 8
Dependent Claim
25 words
The combination of claim 6 including a frame, and an actuator carried by the frame and operatively connected with the plate to move the platen
Claim 9
Dependent Claim
24 words
The combination of claim 2 including said plastic layers of a size to form a waterbed when expanded by fluid and air inserted therebetween
Claim 10
Dependent Claim
10 words
The combination of claim 6 including a compressible cusion interposed
Claim 11
Dependent Claim
23 words
The combination of claim 4 wherein said die structure includes is carried by said other auxiliary plate to project therefrom toward said one
Claim 12
Dependent Claim
10 words
The combination of claim 10 including a resilient cushion interposed
Claim 13
Dependent Claim
81 words
In combination, a. high frequency energy distribution plate means, b. auxiliary capacitor plates forming a plastic sheet receiving work zone therebetween, c. metallic straps interconnecting the distribution plate means and a first of said auxiliary plates, with said straps being of approximately equal length, d. a die rib between the auxiliary plates to concentrate electrical energy flowing therebetween at local portions of plastic sheet means to be heat bonded, and e. means to effect relative closing together of said auxiliary plates.
Claim 14
Dependent Claim
81 words
In combination, a. high frequency energy distribution plate means, b. auxiliary capacitor plates forming a plastic sheet receiving work zone therebetween, c. metallic straps interconnecting the distribution plate means and a first of said auxiliary plates, with said straps being of approximately equal length, d. a die rib between the auxiliary plates to concentrate electrical energy flowing therebetween at local portions of plastic sheet means to be heat bonded, and e. means to effect relative closing together of said auxiliary plates.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |