Patent US2838435A successfully refreshed from Google Patents.
US2838435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming plastic parts
Assignee: Individual
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Filing: 1953-10-08
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Granted: 1958-06-10
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Expires: 1973-10-08
Abstract
No abstract record available.
Inventors
- 👤 Oscar C Hewett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:34
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/342; B29C49/00; B29C49/42; B29C49/44; B29C70/68; B29C70/86; B29C70/865; B29C43/00; B29C43/02; B29C43/10; B29C43/12; B29L; B29L2031/00; B29L2031/30; B29L2031/3076; B29L2031/3082; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1031; Y10T156/1043; Y10T156/1044; Y10T156/1048
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
THE METHOD OF FORMING A HOLLOW PART ON AN ELONGATED INNER MOLD HAVING AN ELASTIC BLANKET THEREON AND WHICH METHOD INCLUDES THE USE OF A CAVITY MOLD FOR DEFINING THE OUTER SURFACE OF THE PART TO BE FORMED, SAID METHOD COMPRISING THE STEPS OF; CONTACTING SAID BLANKET ON SAID INNER MOLD, APPLYING RESIN IMPREGNATED STRIPS OF FABRIC WHILE SAID RESIN IS IN A FLUID STAGE ON THE OUTER SURFACE OF SAID BLANKET, PLACING A TRANSVERSE RIB ON SAID RESIN IMPREGNATING STRIPS OF FABRIC WHILE SAID RESIN IS STILL IN THE FLUID STAGE, EXPANDING SAID BLANKET INSIDE OF SAID CAVITY MOLD AND THEREBY CAUSING THE OUTER SURFACE OF SAID RESIN AND STRIPS OF FABRIC TO CONTACT THE INNER SURFACE OF SAID CAVITY MOLD, SOLIDIFYING SAID RESIN WHILE SAID BLANKET IS EXPANDED, CONTRACTING SAID BLANKET AND REMOVING SAID MANDREL AND SAID BLANKET FROM THE PART THUS FORMED.
Claim 2
Independent Claim
145 words
THE METHOD OF FORMING A HOLLOW PART ON AN ELONGATED INNER MOLD HAVING AN ELASTIC BLANKET THEREON AND WHICH METHOD INCLUDES THE USE OF A CAVITY MOLD FOR DEFINING THE OUTER SURFACE OF THE PART TO BE FORMED, SAID METHOD COMPRISING THE STEPS OF; CONTACTING SAID BLANKET ON SAID INNER MOLD, APPLYING RESIN IMPREGNATED STRIPS OF FABRIC WHILE SAID RESIN IS IN A FLUID STAGE ON THE OUTER SURFACE OF SAID BLANKET, PLACING A TRANSVERSE RIB ON SAID RESIN IMPREGNATING STRIPS OF FABRIC WHILE SAID RESIN IS STILL IN THE FLUID STAGE, EXPANDING SAID BLANKET INSIDE OF SAID CAVITY MOLD AND THEREBY CAUSING THE OUTER SURFACE OF SAID RESIN AND STRIPS OF FABRIC TO CONTACT THE INNER SURFACE OF SAID CAVITY MOLD, SOLIDIFYING SAID RESIN WHILE SAID BLANKET IS EXPANDED, CONTRACTING SAID BLANKET AND REMOVING SAID MANDREL AND SAID BLANKET FROM THE PART THUS FORMED.
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |