Patent Law Blog (Patently-O)

Provisional Patent Applications: Waiting to File Non-Provisionals

For better or worse, provisional patent applications have always been used as a way to delay patent prosecution. The procedure has become popular as a relatively cheap and informal mechanism for preserving priority of invention without losing patent term. Although a provisional application sets a priority date, the application does not even reach the examination queue until the full utility patent application is filed. Thus, on average, each day of delay in filing the utility patent application pushes the issue date back one day as well. However, provisional applications also serve as a mechanism for extending the tail end of the patent term because the twenty-year patent term does not begin to run until filing of the utility patent.

Provisional applications have become quite popular. In FY2007, for instance, over 132,000 provisional applications were filed and about 30% of recent patents assigned to US companies reference a provisional filing. [Link]

To see how provisional filings are being used, I compiled a set of 65,000 patents that issued sometime between Jan 2007 and Feb 2009 (inclusive). All the patents in the group share the common property of claiming priority only to one or more provisional applications. I additionally excluded patents that made other priority claims such as continuations, divisionals, and continuations-in-part. Once I formed the set of patents, I then looked at the filing date of the provisional application compared with the filing of the utility application to how applicants are using the extra year of deferred examination. For patents claiming priority to multiple provisional applications, I used the date of the earliest filed provisional application.

The graph below shows the result. The vast majority of applicants wait until the year is almost up before taking action and filing the non-provisional application. About two-thirds of the non-provisional applications were filed with less than ten days remaining in the one-year provisional pendency. In over ten percent of the cases, applicants properly filed the non-provisional more than 365 days after the original provisional filing because of weekends, holidays, and/or leap year.

Two weeks ago, I had a conversation with a patent litigator about the propensity of patent attorneys to barely meet deadlines. He was worried about the potential for malpractice claims against his firm. And, here, I found a surprising number of cases that appear to miss the deadline.

My lingering question for patent attorneys and applicants -- why delay so long? Is it simply a matter of doing work according to deadline? Does it matter that delaying filing the application also delays the eventual issuance of the patent?

Question on Provisionals?

1. When an issued utility patent claims priority to a provisional patent application, is there a presumption that the claimed invention is supported by the provisional?
2. What is wrong with filing claims in a provisional application?

A First Look at Who Files Provisional Patent Applications

As part of the 1995 patent law overhaul, the USPTO began allowing patent applicants to file provisional patent applications.  Over a decade later, these lower-cost provisional filings have taken hold.  According to PTO annual reports, over 132,000 provisional patent applications were filed in fiscal year 2007. In perspective, that number is over 30% of the number of the 439,000 non-provisional utility patents filed during the same period. This proportion has been slowly rising since 2002 when the provisional applications filing rate was about 27% of the non-provisional rate.[1] That year (2002), the PTO recorded just under 90,000 provisional applications and 332,000 non-provisional patent applications.

Interestingly, in my study of recently issued patents, only 21% reference a provisional application as a parent. (In the study, I look at approximately 15,000 utility patents issued in April and May 2008.) [2] 

National Tool: Over half of the recently issued patents that listed an assignee indicated that the assignee was a foreign (non-U.S.) corporation or agency.[4]  Although foreign entities are not prohibited from filing provisional applications, the provisional tool was designed to benefit U.S. entities. Thus, it is not a surprise that only 5% of the patents assigned to international applicants were associated with a provisional application while 30% of the patents assigned to a U.S. applicant were associated with a provisional application.  Two countries – Israel and Canada – stood out as filing the highest proportion of provisional parent claims. Both of these countries are known for having patent attorneys with a high level of familiarity with U.S. laws.  Only 2% of the Japanese & Korean patents included provisional parent claims. [Updated June 03 with Corrected Figure]

The provisional application provides a potential extra year of patent eligibility at the end of the term.  Thus, it is also not surprising that new drug inventions – where a potential year at the end of the term is most valuable – have the highest rate of association with a provisional application.[5]  Likewise, patents on electrical and electronic applications had the lowest rate of provisional filing even after excluding the international applications.

The provisional filings appeared to have almost no impact on the pendency time of a patent application as measured by the number of days from filing the nonprovisional to issuance.  This makes sense as no examination takes place until the nonprovisional application is filed.

The following table also provides some interesting comparisons of patent strategy.[6]

Type of Technology	Number of Utility Patents in the Sample	Number of Patents Referencing Provisional Parent		Assignee
Mechanical	24	1	4%	Ford
	25	13	52%	GM
Drugs & Medical	7	4	57%	Wyeth
	8	7	88%	Genentech
	11	1	9%	Boston Scientific Scimed
	21	10	48%	Medtronic
Computers & Communications	15	12	80%	InterDigital
	23	7	30%	Oracle
	31	11	35%	QUALCOMM
	44	25	57%	Broadcom
	114	16	14%	Microsoft
Chemical	6	6	100%	Bristol-Myers Squibb
	9	4	44%	Procter Gamble
	10	3	30%	3M Innovative Properties
	14	9	64%	EI du Pont de Nemours
	17	0	0%	General Electric[7]
	17	16	94%	Genentech

 

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[1] This information comes from PTO annual reports for FY 2006 and 2007.

[2] These patents were downloaded on May 30. I excluded the few patents filed prior to the 1995 introduction of provisional patent applications.

[3] In a follow-on study, I will look at published patent applications claiming priority to provisional applications to get some sense of how often folks abandon provisional patent applications.

[4] 6823 were assigned to foreign entity while 6457 were assigned to a U.S. entity. Another 1922 had no listed assignee.

[5] My study included 677 patents having a primary U.S. Classification in a “drug” field and also assigned to a U.S. entity. Of those, 48% were associated with a provisional application.

[6] Note, my assignee ‘scrubber’ is not yet perfect. Thus, it is likely that some patents associated with listed assignees are not included in the table.

[7] Some companies, such as GE hold patents in several different categories – this table looks only at those patents in the particular identified category.