Patent US2739636A successfully refreshed from Google Patents.
US2739636A
Expired / Lapsed
US
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Method and apparatus for bending c-stage postformable plastic material
Assignee: North American Aviation Corp
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Filing: 1953-06-19
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Granted: 1956-03-27
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Expires: 1973-06-19
Abstract
No abstract record available.
Inventors
- 👤 Truman V Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:44
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/02; B29C53/04; B29C53/06; B29C53/063; B29C53/066; B29D; B29D99/00; B29D99/0039; B29K; B29K2711/00; B29K2711/12; B29K2711/126; B29L; B29L2031/00; B29L2031/44; B29L2031/441; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T156/1046; Y10T156/1089; Y10T156/1092
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A DEVICE FOR BENDING UNBACKED PORTIONS OF A SHEET OF POSTFORMABLE MATERIAL PORTIONS OF WHICH ARE BACKED WITH A RIGID REINFORCING MATERIAL, SAID DEVICE COMPRISING A FIXED A RECEIVING AND SECURING PORTIONS OF SAID SHEET WHEREBY AN UNBACKED PORTION THEREOF IS UNCONSTRAINED BY SAID FIXTURE; MEANS ASSOCIATED WITH SAID FIXTURE FOR SUPPORTING A DIE ADJACENT SAID UNBACKED PORTION OF SAID SHEET WHEN SO HELD; A HEATER ASSOCIATED WITH SAID FIXTURE FOR HEATING SAID UNBACKED PORTION TO THE APPROXIMATE RANGE OF 250* F. TO 350* F.; AND MEANS ASSOCIATED WITH SAID FIXTURE FOR SIMULTANEOUSLY APPLYING TENSION TO AND BENDING ABOUT SAID DIE SAID UNBACKED PORTION WHEN SO HEATED, AND HOLDING SAID PORTION SO BENT UNTIL COOLED.
Claim 2
Independent Claim
115 words
A DEVICE FOR BENDING UNBACKED PORTIONS OF A SHEET OF POSTFORMABLE MATERIAL PORTIONS OF WHICH ARE BACKED WITH A RIGID REINFORCING MATERIAL, SAID DEVICE COMPRISING A FIXED A RECEIVING AND SECURING PORTIONS OF SAID SHEET WHEREBY AN UNBACKED PORTION THEREOF IS UNCONSTRAINED BY SAID FIXTURE; MEANS ASSOCIATED WITH SAID FIXTURE FOR SUPPORTING A DIE ADJACENT SAID UNBACKED PORTION OF SAID SHEET WHEN SO HELD; A HEATER ASSOCIATED WITH SAID FIXTURE FOR HEATING SAID UNBACKED PORTION TO THE APPROXIMATE RANGE OF 250* F. TO 350* F.; AND MEANS ASSOCIATED WITH SAID FIXTURE FOR SIMULTANEOUSLY APPLYING TENSION TO AND BENDING ABOUT SAID DIE SAID UNBACKED PORTION WHEN SO HEATED, AND HOLDING SAID PORTION SO BENT UNTIL COOLED.
Claim 3
Independent Claim
165 words
THE METHOD OF PROVIDING A REINFORCED PLASTIC ARTICLE HAVING AT LEAST ONE BENT PORTION COMPRISING THE STEPS OF ATTACHING TO ONE SIDE OF A SUBSTANTIALLY FLAT SHEET OF C-STAGE THERMOSETTING RESINOUS MATERIAL RIGID BACKING MEMBERS DISPOSED IN SPACED PARALLELISM WHEREBY THE EDGES THEREOF DEFINE AN UNREINFORCED PORTION OF SAID SHEET; SUPPORTING AN ELONGATED DIE ADJACENT SAID UNREINFORCED PORTION BETWEEN THE EDGES OF ADJACENT BACKING MEMBERS; HEATING SAID UNREINFORCED PORTION TO THE APPROXIMATE RANGE OF 250* F. TO 350* F.: GRIPPING REINFORCED PORTIONS OF SAID SHEET ON EITHER SIDE OF SAID UNRESINFORCED PORTION; URGING SAID REINFORCED PORTIONS APART WHEREBY TENSION IS APPLIED TO SAID UNREINFORCED PORTION; PIVOTING SAID REINFORCED PORTIONS RELATIVE TO EACH OTHER SO AS TO BEND SAID UNREINFORCED PORTION ABOUT SAID DIE; AND REMOVING THE SUPPORT FROM SAID DIE DURING SAID BEND AND IMMEDIATELY PRIOR TO THE COMPLETION THEREOF WHEREBY WHEN SAID BEND IS COMPLETED SAID DIE IS DISPOSED IN ENGAGEMENT WITH SAID BENT PORTION AND IN ABUTTING RELATIONSHIP WITH SAID ADJACENT BACKING MEMBERS.
Claim 4
Independent Claim
165 words
THE METHOD OF PROVIDING A REINFORCED PLASTIC ARTICLE HAVING AT LEAST ONE BENT PORTION COMPRISING THE STEPS OF ATTACHING TO ONE SIDE OF A SUBSTANTIALLY FLAT SHEET OF C-STAGE THERMOSETTING RESINOUS MATERIAL RIGID BACKING MEMBERS DISPOSED IN SPACED PARALLELISM WHEREBY THE EDGES THEREOF DEFINE AN UNREINFORCED PORTION OF SAID SHEET; SUPPORTING AN ELONGATED DIE ADJACENT SAID UNREINFORCED PORTION BETWEEN THE EDGES OF ADJACENT BACKING MEMBERS; HEATING SAID UNREINFORCED PORTION TO THE APPROXIMATE RANGE OF 250* F. TO 350* F.: GRIPPING REINFORCED PORTIONS OF SAID SHEET ON EITHER SIDE OF SAID UNRESINFORCED PORTION; URGING SAID REINFORCED PORTIONS APART WHEREBY TENSION IS APPLIED TO SAID UNREINFORCED PORTION; PIVOTING SAID REINFORCED PORTIONS RELATIVE TO EACH OTHER SO AS TO BEND SAID UNREINFORCED PORTION ABOUT SAID DIE; AND REMOVING THE SUPPORT FROM SAID DIE DURING SAID BEND AND IMMEDIATELY PRIOR TO THE COMPLETION THEREOF WHEREBY WHEN SAID BEND IS COMPLETED SAID DIE IS DISPOSED IN ENGAGEMENT WITH SAID BENT PORTION AND IN ABUTTING RELATIONSHIP WITH SAID ADJACENT BACKING MEMBERS.
References Cited (Backward Citations)
USRE18808E
Cited
US1666649A
Cited
US2183984A
Cited
US2214673A
Cited
US2382807A
Cited
US2648370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |