US4299349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-piece containers made from filled thermoplastic sheet material
Assignee: SWEETHART CUP COMPANY Inc
•
Filing: 1977-05-10
•
Granted: 1981-11-10
•
Expires: 1997-05-10
Abstract
Abstract A method and apparatus are provided for forming two-piece drinking cups and containers from conventionally shaped arcuate sidewall blank and bottom blanks of filled polypropylene sheet material or polypropylene-polyethylene copolymer sheet material with approximately 40% talc or calcium carbonate as a filler. The arcuate blanks for the sidewall and the bottom blanks are run through relatively standard two-piece container or cup making machinery utilizing patterned air jet heating means to heat areas of the filled plastic sheet material such that the sidewall and bottom curl seams can be heat sealed on the forming mandrels of the machinery and the top curl can be placed in the container by heating and substantially conventional forming dies. The seaming structures so produced are extremely water tight and of high strength characteristics.
Inventors
- 👤 Morton Gilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:28
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/01; B29C66/05; B29C66/20; B29C66/21; B29C57/00; B29C57/12; B29C65/00; B29C65/02; B29C65/10; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/131; B29C66/135; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/49; B29C66/50; B29C66/51; B29C66/54; B29C66/542; B29C66/545; B29C66/63; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C69/00; B65; B65D; B65D3/00; B65D3/10; B29C48/00; B29C48/001; B29C48/0017; B29C48/03; B29C48/07; B29C48/08; B29C65/78; B29C65/7841; B29C65/7847; B31; B31B; B31B2105/00; B31B2105/002; B31B2105/0022
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
136 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; wherein said heat sealed side seam is formed from a plurality of aligned adjacent heat softened discrete areas formed on opposed lapped surfaces of said sidewall blank and pressed into fused cohesion along the length of said sidewall.
Claim 2
Dependent Claim
136 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; wherein said heat sealed side seam is formed from a plurality of aligned adjacent heat softened discrete areas formed on opposed lapped surfaces of said sidewall blank and pressed into fused cohesion along the length of said sidewall.
Claim 3
Dependent Claim
27 words
The invention defined in claim 1, wherein said polyolefin comprises primarily polypropylene and wherein said filler material is from the group consisting of talc and calcium carbonate.
Claim 4
Dependent Claim
162 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; wherein said heat sealed side seam is formed from a plurality of aligned adjacent heat softened discrete areas formed on opposed lapped surfaces of said sidewall blank and pressed into fused cohesion along the length of said sidewall; wherein said discrete heat softened and fused discrete areas are interspersed with heat sealed areas initially softened to a lesser degree than said discrete areas.
Claim 5
Dependent Claim
162 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; wherein said heat sealed side seam is formed from a plurality of aligned adjacent heat softened discrete areas formed on opposed lapped surfaces of said sidewall blank and pressed into fused cohesion along the length of said sidewall; wherein said discrete heat softened and fused discrete areas are interspersed with heat sealed areas initially softened to a lesser degree than said discrete areas.
Claim 6
Dependent Claim
27 words
The invention defined in claim 3, wherein said polyolefin comprises primarily polypropylene and wherein said filler material is from the group consisting of talc and calcium carbonate.
Claim 7
Dependent Claim
216 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; and said bottom blank being formed with a domed central portion extending upward into said container and said annular mating surface being substantially horizontally disposed about the periphery of said domed central portion; said bottom blank forming a lapped heat sealed bottom seam structure between said annular interior surface portion of said sidewall and said annular mating surface of said bottom blank; and said bottom seam being formed from a plurality of aligned adjacent heat softened discrete areas formed in opposition on said interior surface position and said annular mating surface and fused together, said discrete areas being interspersed with heat sealed areas initially softened to a lesser degree than said discrete heat softened and fused areas.
Claim 8
Dependent Claim
216 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; and said bottom blank being formed with a domed central portion extending upward into said container and said annular mating surface being substantially horizontally disposed about the periphery of said domed central portion; said bottom blank forming a lapped heat sealed bottom seam structure between said annular interior surface portion of said sidewall and said annular mating surface of said bottom blank; and said bottom seam being formed from a plurality of aligned adjacent heat softened discrete areas formed in opposition on said interior surface position and said annular mating surface and fused together, said discrete areas being interspersed with heat sealed areas initially softened to a lesser degree than said discrete heat softened and fused areas.
Claim 9
Dependent Claim
194 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; wherein said heat sealed side seam is formed from a plurality of aligned adjacent heat softened discrete areas formed on opposed lapped surfaces of said sidewall blank and pressed into fused cohesion along the length of said sidewall; wherein said discrete heat softened and fused discrete areas are interspersed with heat sealed areas initially softened to a lesser degree than said discrete areas; and said bottom blank being formed with a domed central portion extruding upward into said container and said annular mating surface being substantially horizontally disposed about the periphery of said domed central portion.
Claim 10
Dependent Claim
194 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; wherein said heat sealed side seam is formed from a plurality of aligned adjacent heat softened discrete areas formed on opposed lapped surfaces of said sidewall blank and pressed into fused cohesion along the length of said sidewall; wherein said discrete heat softened and fused discrete areas are interspersed with heat sealed areas initially softened to a lesser degree than said discrete areas; and said bottom blank being formed with a domed central portion extruding upward into said container and said annular mating surface being substantially horizontally disposed about the periphery of said domed central portion.
Claim 11
Dependent Claim
91 words
The invention defined in claim 6, wherein said bottom blank forms a lapped heat sealed bottom seam structure between said annular interior surface portion of said sidewall and said annular mating surface of said bottom blank; and said bottom seam is formed from a plurality of aligned adjacent heat softened discrete areas formed in opposition on said interior surface portion and said annular mating surface and fused together, said discrete areas being interspersed with heat sealed areas initially softened to a lesser degree than said discrete heat softened and fused areas.
Claim 12
Dependent Claim
183 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; said bottom blank forming a lapped heat sealed bottom seam structure between said annular interior surface portion of said sidewall and said annular mating surface of said bottom blank; and said bottom seam being formed from a plurality of aligned adjacent heat softened discrete areas formed in opposition on said interior surface position and said annular mating surface and fused together, said discrete areas being interspersed with heat sealed areas initially softened to a lesser degree than said discrete heat softened and fused areas.
Claim 13
Dependent Claim
183 words
A heat sealed two-piece container comprising: a sidewall blank of polyolefin sheet material including dispersed inorganic filler on the order of 30% to 50% by weight of the sheet material; said sidewall blank having a lapped heat sealed side seam; and a bottom blank of said polyolefin sheet material inserted in one end of said sidewall blank and having an annular mating surface adjacent an interior surface of said sidewall blank; said sidewall blank being deformed to engage an annular portion of its said interior surface with said annular mating surface of said bottom blank and heat sealed thereto; said bottom blank forming a lapped heat sealed bottom seam structure between said annular interior surface portion of said sidewall and said annular mating surface of said bottom blank; and said bottom seam being formed from a plurality of aligned adjacent heat softened discrete areas formed in opposition on said interior surface position and said annular mating surface and fused together, said discrete areas being interspersed with heat sealed areas initially softened to a lesser degree than said discrete heat softened and fused areas.
Claim 14
Dependent Claim
27 words
The invention defined in claim 8, wherein said polyolefin comprises primarily polypropylene and wherein said filler material is from the group consisting of talc and calcium carbonate.
Claim 15
Dependent Claim
44 words
The invention defined in claim 8, wherein said heat sealed side seam is formed from a plurality of aligned adjacent heat softened discrete areas formed on opposed lapped surfaces of said sidewall blank and pressed into fused cohesion along the length of said sidewall.
Claim 16
Dependent Claim
27 words
The invention defined in claim 10, wherein said polyolefin comprises primarily polypropylene and wherein said filler material is from the group consisting of talc and calcium carbonate.
References Cited (Backward Citations)
US3182882A
Cited
US3312383A
Cited
US3438824A
Cited
US3499820A
Cited
US3468467A
Cited
US3450327A
Cited
US3664568A
Cited
US3854583A
Cited
US3931380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |