US3251908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making a curved surface
Assignee: Computing Devices of Canada Ltd
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Filing: 1962-12-05
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Granted: 1966-05-17
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Expires: 1982-12-05
Abstract
No abstract record available.
Inventors
- 👤 George P T Wilenius
- 👤 Kenneth B Eacott
- 👤 Gerard W Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:56
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29C; B29C39/00; B29C39/22; B29C39/26; B29D11/0048; B29D11/00548; B29D11/00557; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD OF UTILIZING A MEMBRANE TO FORM A CURVED SURFACE COMPRISING, DIVIDING A CHAMBER INTO TWO ZONES WITH SAID MEMBRANE, DIRECTING INTO ONE OF SAID ZONES A FLUID UNDER A FIRST HEAD AND INTO CONTACT WITH SUBSTANTIALLY THE ENTIRE SURFACE OF ONE SIDE OF SAID MEMBRANE, DIRECTING INTO THE OTHER OF SAID ZONES A HARDENABLE LIQUID PLASTIC MATERIAL UNDER A SECOND HEAD AND INTO CONTACT WITH SUBSTANTIALLY THE ENTIRE SURFACE OF THE OPPOSITE SIDE OF SAID MEMBRANE, AND HARDENING THE LIQUID PLASTIC MATERIAL.
Claim 2
Independent Claim
84 words
A METHOD OF UTILIZING A MEMBRANE TO FORM A CURVED SURFACE COMPRISING, DIVIDING A CHAMBER INTO TWO ZONES WITH SAID MEMBRANE, DIRECTING INTO ONE OF SAID ZONES A FLUID UNDER A FIRST HEAD AND INTO CONTACT WITH SUBSTANTIALLY THE ENTIRE SURFACE OF ONE SIDE OF SAID MEMBRANE, DIRECTING INTO THE OTHER OF SAID ZONES A HARDENABLE LIQUID PLASTIC MATERIAL UNDER A SECOND HEAD AND INTO CONTACT WITH SUBSTANTIALLY THE ENTIRE SURFACE OF THE OPPOSITE SIDE OF SAID MEMBRANE, AND HARDENING THE LIQUID PLASTIC MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |