US3270104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum forming of plastic material
Assignee: WR Grace and Co
•
Filing: 1961-12-12
•
Granted: 1966-08-30
•
Expires: 1981-12-12
Abstract
No abstract record available.
Inventors
- 👤 Robert L Dreyfus
- 👤 John W Harrison
- 👤 Robert D Lowry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:39
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/002; B29C71/00; B29C71/04; B29C53/00; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/10; B29K2023/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS COMPRISING HEATING AN ORIENTABLE PLASTIC FILM, POSITIONING THE FILM ACROSS THE CORE OF A HOLLOW MOLD, APPLYING VACUUM TO BIAXIALLY STRETCH ORIENT THE FILM ON BOTH THE INSIDE AND OUTSIDE OF SAID CORE AND APPLYING PRESSURE TO THE FILM FORMED INSIDE SAID CORE TO POSITION SAID INSIDE FILM ABOVE SAID OUTSIDE FILM.
Claim 2
Dependent Claim
54 words
A PROCESS COMPRISING HEATING AN ORIENTABLE PLASTIC FILM, POSITIONING THE FILM ACROSS THE CORE OF A HOLLOW MOLD, APPLYING VACUUM TO BIAXIALLY STRETCH ORIENT THE FILM ON BOTH THE INSIDE AND OUTSIDE OF SAID CORE AND APPLYING PRESSURE TO THE FILM FORMED INSIDE SAID CORE TO POSITION SAID INSIDE FILM ABOVE SAID OUTSIDE FILM.
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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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |