US3308213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum forming die and method
Assignee: Kirkhof Manufacturing Corp
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Filing: 1963-05-27
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Granted: 1967-03-07
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Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 William H Carrigan
- 👤 Robert E O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:43
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/32; B29C51/10; Y; Y10; Y10S; Y10S425/00; Y10S425/037
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PRESSURE DIFFERENTIAL FORMING DIE FOR PLASTIC CONTAINER LIDS COMPRISING: PERIPHERAL MEANS FOR HOLDING AND SEALING A PLASTIC SHEET AGAINST A LOWER PRESSURE PLATE; DIE FORMING MEANS; AND POINTED SHEET PUNCTURING NEEDLE ELEMENTS PROJECTING FROM SURFACES OF SAID FORMING MEANS, AND SO ORIENTED WITH RESPECT TO SAID SURFACES AS TO BE ARRANGED NON-PERPENDICULAR TO THE ADJACENT SHEET PORTIONS WHEN FORCED AGAINST SAID FORMING MEANS WITHOUT RELIEVING SAID PRESSURE DIFFERENTIAL.
Claim 2
Independent Claim
91 words
A METHOD OF FORMING A PLASTIC CONTAINER LID FOR HOT LIQUIDS TO BE VENTED, COMPRISING THE STEPS OF: HOLDING AND SEALING THE PERIPHERY OF AN IMPERFORATE PLASTIC SHEET PORTION; POSITIONING A FACE PATTERN AND AT LEAST ONE POINTED NEEDLE PROJECTION ADJACENT SAID SHEET PORTION; APPLYING A PRESSURE DIFFERENTIAL TO SAID SHEET TO FORCE IT AGAINST SAID PATTERN AND SIMULTANEOUSLY IMPALE IT ON SAID NEEDLE PROJECTION TO PUNCTURE A TEMPORARILY NON-LEAKING ORIFICE; AND EJECTING THE FORMED SHEET PORTION FROM SAID FACE WHILE SLIDING IF OFF SAID NEEDLE TO PROVIDE A VENTED LID.
References Cited (Backward Citations)
US3225461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |