Long Patent Prosecutions

The following is a list of “Old Act” patents that issued with the largest time span between the filing date and the issue date. Unissued “Old Act” patents are not published so there may be others which are still pending. Also my data is not completely, so this list is only based on recently issued “Old Act” patents. If you notice any omissions or errors, please let me know.

[List generated June 22, 2013]

Patent Number Title Filing Date Issue Date Duration (years)
1 1341558 RADAR JAMMING METHOD AND APPARATUS 1965-09-22 2007-10-23 42.11
2 1341487 INFRARED DECEPTION COUNTERMEASURES SYSTEM 1967-12-08 2005-08-16 37.72
3 1341519 PROSTHETIC VASCULAR GRAFT 1975-01-16 2007-01-02 31.98
4 1341533 MULTIPLE SPECTRAL BAND OPTO-MECHANICAL MODULATO 1975-09-10 2007-07-03 31.83
5 1341475 OPTICAL DETECTION SYSTEM 1973-06-06 2005-03-15 31.79
6 1336083 CONTROL SYSTEMS FOR MOVING BODIES 1964-06-04 1995-06-27 31.08
7 1341218 RADIATION SUPPRESSION 1971-01-22 2001-05-01 30.29
8 1336292 CONTROL SYSTEMS FOR MISSILES AND OTHER MOVING BODIE 1965-12-06 1995-07-11 29.61
9 1336085 MISSILE CONTROL MECHANISM 1965-12-06 1995-06-27 29.58
10 1336084 MISSILE CONTROL SYSTEM 1965-12-06 1995-06-27 29.58
11 1336086 CONTROL SYSTEMS FOR MOVING BODIES 1966-03-04 1995-06-27 29.33
12 1341633 INTERLEUKIN-2 POLYPEPTIDES 1983-12-15 2013-01-29 29.15
13 1341604 DNA SEQUENCES, RECOMBINANT DNA MOLECULES AND PROCESSES FOR PRODUCING HUMAN FIBROBLAST INTERFERON-LIKE POLYPEPTIDE 1981-04-01 2010-05-04 29.11
14 1332460 SONAR TRANSDUCER 1965-09-28 1994-10-11 29.05
15 1341638 FIBROBLAST GROWTH FACTOR 1986-06-09 2014-06-17 28.04
16 1341640 RECOMBINANT FIBROBLAST GROWTH FACTORS 1986-09-12 2014-09-16 28.03
17 1341583 INTERFERONS AND PROCESS FOR THEIR PREPARATION 1981-06-30 2008-11-18 27.41
18 1341567 DNA SEQUENCES, RECOMBINANT DNA MOLECULES AND PROCESSES FOR PRODUCING HUMAN INTERFERON – LIKE POLYPEPTIDE 1981-01-07 2008-02-19 27.13
19 1341563 DNA CODING FOR HUMAN FIBROBLAST INTERFERON POLYPEPTIDE AND RECOMBINANT PLASMI 1980-10-30 2007-12-04 27.11
20 1341622 INSECT RESISTANT PLANT 1984-09-24 2011-10-04 27.04
21 1341569 MICROBIAL PRODUCTION OF HUMAN FIBROBLAST INTERFERON 1981-09-24 2008-03-25 26.52
22 1341637 CHEMILUMINESCENT ACRIDINIUM SALTS 1987-10-14 2014-03-18 26.44
23 1341630 TRANSFORMATION VECTORS ALLOWING EXPRESSION OF FOREIGN POLYPEPTIDE ENDOTOXINS IN PLANT 1986-01-17 2012-06-05 26.40
24 1341590 HUMAN IMMUNE INTERFERON 1982-10-18 2009-02-03 26.32
25 1341625 RECOMBINANT MAMMALIAN GM-CSF, DNA ENCODING MAMMALIAN GM-SCF AND METHODS OF USE THEREON 1985-11-13 2011-12-20 26.12

Canadian Intellectual Property