US3740178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug assembly for thermoforming
Assignee: Standard Oil Co
•
Filing: 1971-04-21
•
Granted: 1973-06-19
•
Expires: 1991-04-21
Abstract
Abstract A novel plug assembly for use in thermoforming of plastics comprises a combination of a plug body made of a relatively highly heat-conductive material fitted with holding means passing therethrough made from a high tensile strength material, said holding means and said plug body being spaced from one another by a self-adjusting spacing member providing compensation for thermal expansion and contraction.
Inventors
- 👤 P Neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:17
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/04; B29C33/00; B29C33/02; B29C33/30; B29C33/306
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
The plug assembly of claim 1 wherein said base portion of said body is fitted with aligning means for alignment of said body with said platen.
Claim 2
Dependent Claim
27 words
The plug assembly of claim 2 wherein said aligning means consist of one or more projections adapted to Match with one or more recesses in said platen.
Claim 3
Dependent Claim
18 words
The plug assembly of claim 3 wherein said plug body is aluminum and said retaining bolt is steel.
References Cited (Backward Citations)
US2968855A
Cited
US3132381A
Cited
US3228071A
Cited
US3528487A
Cited
US3587144A
Cited
US3650653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |