US3666162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed polymer cup and method for making same
Assignee: JAMES R TIFFIN
•
Filing: 1966-06-07
•
Granted: 1972-05-30
•
Expires: 1986-06-07
Abstract
Abstract An improved polystyrene vending machine cup is made by vacuum forming and deep drawing a sheet consisting of a closed cell foam resin core with a nonporous, smooth tough resin skin on both sides of the core. The sheet is formed by extrusion of a hot sheet of foamable thermoplastic resin and quench chilling the surfaces of the sheet to form the skins on each side of the core. The cup can be held in the hand when filled with material having a temperature of 100* C.
Inventors
- 👤 James R Tiffin
- 👤 Earl Erdman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:47
CPC Classifications
B; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/265; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29D; B29D22/00; B29D22/003; C; C08; C08J; C08J9/00; C08J9/34; B29C51/00; B29C51/10; B29K; B29K2025/00; B29K2105/00; B29K2105/04; B29K2105/043; B29L; B29L2007/00; B29L2007/008; B29L2031/00; B29L2031/712; B29L2031/7132
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A process according to claim 1 wherein the sheet prior to vacuum forming has a thickness of 85-90 mils and a density of 20-35 lbs./cu. ft. and the core is at least 70 percent of the total thickness of the core and skins and the major portion of the cup wall means has a thickness between 25 and 40 mils.
Claim 2
Dependent Claim
37 words
A process according to claim 2 wherein the starting foamed sheet is one which has been foamed with the aid of a nucleating agent and the closed cells have a cell diameter of 0.01 to 0.5 mm.
Claim 3
Dependent Claim
39 words
A proCess according to claim 1 wherein the deep drawing is to an extent sufficient to reduce the thickness of the sheet to at least about one-half its original thickness in the major portion of the cup wall means.
Claim 4
Dependent Claim
9 words
A cup made by the process of claim 1.
Claim 5
Dependent Claim
187 words
A cup having wall means, said cup having been made by a process comprising forming a foam sheet by extrusion of a hot, wrinkle and distortion free sheet of foamable thermoplastic styrene polymer having a thickness of 85 to 90 mils and a density of 35 lbs./cu.ft. and quench chilling the surfaces of said sheet to form a sheet consisting of (1) a closed cell foam resin core, (2) a nonporous, smooth, tough resin outer skin on one side of the core, and (3) a nonporous, smooth, tough resin skin on the other side of the core, said core comprising over 50 percent of the total thickness of said skins and core, said core being integral with said skins and being composed of the identical material as said skins, said skins having a substantially higher density than said core and each skin being at least 3 percent of the total thickness of the skins and core, and supplying sufficient heat to thermoform said sheet and thermoforming said sheet into a cup having a core density of 12 to 45 lbs./cu.ft., said wall means being in stretched condition.
References Cited (Backward Citations)
US2917217A
Cited
US2905350A
Cited
US2893877A
Cited
GB854586A
Cited
US3011217A
Cited
US3039911A
Cited
US3042972A
Cited
US3111710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |