US3235638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming plastic containers
Assignee: Hedwin Corp
•
Filing: 1961-09-07
•
Granted: 1966-02-15
•
Expires: 1981-09-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Winstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:59
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/02; B29C49/06905; B29C49/0691; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/30; B29C48/345; B29C51/00; B29C51/26; B29C51/266; B29C51/267; B29C49/42; B29C49/78; B29C2049/787; B29C2049/78715; B29C2949/00; B29C2949/30; B29C2949/3032; B29C2949/3041; B29C48/001; B29C48/0017; B29C48/15; B29C49/06914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A METHOD OF MANUFACTURING CONTAINERS FROM PLASTIC SHEET MATERIAL, COMPRISING CONTINUOUSLY EXTRUDING TWO TRANSVERSELY SPACED SHEETS OF THERMOPLASTIC MATERIAL, ADVANCING SAID SPACED SHEETS BETWEEN TWO OPPOSED, HORIZONTALLY SEPARABLE MOLD HALVES WHILE THE LATTER ARE SEPARATED, INTERMITTENTLY AND MOMENTARILY HALTING THE ADVANCE OF SAID SHEETS, SUBJECTING SAID MOLD HAVLES TO VACUUM WHILE INITIATING THEIR LINEAR CLOSURE INTO PARALEL SURFACE CONTACT WITH RESPECTIVE ADJACENT SHEETS TO SEPARATELY BUT SIMULTANEOUSLY VACCUM MOLD THE CONATACTED AREAS OF SAID SHEETS INTO COMPLETELY PREFORMED SEPARATE OPPOSED CONTAINER HALVES AND THEN CLOSING THE MOLD HALVES TO JOIN AND SEAL SAID SHEETS IN A FLAT PLANE SIMULTANEOUSLY ALONG ALL BOUNDARIES OF SAID MOLD HALVES TO FORM CLOSED CONTAINERS FROM THE PREVIOUSLY FORMED PORTIONS THEREOF WHILE STILL SUPPORTED IN RESPECTIVE SHEETS, SUSPENDING, UNDER THE INFLUENCE OF GRAVITY, THE PORTIONS OF SAID SHEETS ANTERIOR TO SAID MOLD HALVES DURING SAID MOMENTARY HALTING TO PERMIT GATHERING THEREOF, SEPARATING SAID MOLD HALVES TO RELEASE SAID FORMED CONTAINERS, RESUMING THE ADVANCE OF SAID SHEETS AND THE CONTAINERS SUPPORTED THEREBY, AND SUBSEQUENTLY REMOVING SAID CONTAINERS FROM SAID SHEETS.
Claim 2
Independent Claim
174 words
A METHOD OF MANUFACTURING CONTAINERS FROM PLASTIC SHEET MATERIAL, COMPRISING CONTINUOUSLY EXTRUDING TWO TRANSVERSELY SPACED SHEETS OF THERMOPLASTIC MATERIAL, ADVANCING SAID SPACED SHEETS BETWEEN TWO OPPOSED, HORIZONTALLY SEPARABLE MOLD HALVES WHILE THE LATTER ARE SEPARATED, INTERMITTENTLY AND MOMENTARILY HALTING THE ADVANCE OF SAID SHEETS, SUBJECTING SAID MOLD HAVLES TO VACUUM WHILE INITIATING THEIR LINEAR CLOSURE INTO PARALEL SURFACE CONTACT WITH RESPECTIVE ADJACENT SHEETS TO SEPARATELY BUT SIMULTANEOUSLY VACCUM MOLD THE CONATACTED AREAS OF SAID SHEETS INTO COMPLETELY PREFORMED SEPARATE OPPOSED CONTAINER HALVES AND THEN CLOSING THE MOLD HALVES TO JOIN AND SEAL SAID SHEETS IN A FLAT PLANE SIMULTANEOUSLY ALONG ALL BOUNDARIES OF SAID MOLD HALVES TO FORM CLOSED CONTAINERS FROM THE PREVIOUSLY FORMED PORTIONS THEREOF WHILE STILL SUPPORTED IN RESPECTIVE SHEETS, SUSPENDING, UNDER THE INFLUENCE OF GRAVITY, THE PORTIONS OF SAID SHEETS ANTERIOR TO SAID MOLD HALVES DURING SAID MOMENTARY HALTING TO PERMIT GATHERING THEREOF, SEPARATING SAID MOLD HALVES TO RELEASE SAID FORMED CONTAINERS, RESUMING THE ADVANCE OF SAID SHEETS AND THE CONTAINERS SUPPORTED THEREBY, AND SUBSEQUENTLY REMOVING SAID CONTAINERS FROM SAID SHEETS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |